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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 23,353

Hi,

#3817. A card is drawn at random from a pack of 52 cards. Find the probability that the card drawn is jack, queen, or king.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**Monox D. I-Fly****Member**- Registered: 2015-12-02
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*Last edited by Monox D. I-Fly (2017-10-15 16:18:23)*

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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 23,353

Hi,

The solution #3817 is correct. Neat work, Monox D. I-Fly!

#3818. A card is drawn at random from a pack of 52 cards. Find the probability that the card drawn is neither a red card nor a queen.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**Monox D. I-Fly****Member**- Registered: 2015-12-02
- Posts: 886

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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 23,353

Hi,

Good attempt, Monox D. I-Fly!

#3819. A 16 meter deep well with diameter 3.5 meter is dug up and the earth from it is spread evenly to form a platform 27.5 meter by 7 meter. Find the height of the platform,

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 23,353

Hi,

#3820. Solve:

3x + y + 1 = 0,

2x - 3y + 8 = 0.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 23,353

Hi,

#3821. Solve:

2x + y - 3 = 0,

2x - 3y - 7 = 0.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**Monox D. I-Fly****Member**- Registered: 2015-12-02
- Posts: 886

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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 23,353

Hi,

The solution set in #3821 is correct. Good work, Monox D. I-Fly!

#3822. Solve:

x + y = 4,

2x - 3y = 3.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**Monox D. I-Fly****Member**- Registered: 2015-12-02
- Posts: 886

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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 23,353

Hi,

The solution #3822 is correct. Neat work, Monox D. I-Fly!

#3823. Solve:

2x + 3y = 4,

x - y + 3 = 0.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**Monox D. I-Fly****Member**- Registered: 2015-12-02
- Posts: 886

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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 23,353

Hi,

The solution set in #3823 is correct. Good work, Monox D. I-Fly!

#3824. Solve:

2x - 3y + 13 = 0,

3x - 2y + 12 = 0.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 23,353

Hi,

#3825. Solve:

2x + 3y + 5 = 0,

3x - 2y - 12 = 0.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 23,353

Hi,

#3826. Solve:

3x - 7y + 10 = 0,

y - 2x - 3 = 0.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 23,353

Hi,

#3827. Solve:

x + 2y + z = 7,

x + 3z = 11,

2x - 3y = 1.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 23,353

Hi,

#3828. Solve:

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 23,353

Hi,

#3829. Solve:

11x + 15y + 23 = 0,

7x - 2y - 20 = 0.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 23,353

Hi,

#3830. Solve:

,Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 23,353

Hi,

#3831. Find the mean of first 'n' odd natural number.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 23,353

Hi,

#3832. If the mean of first n odd numbers is

, find the value of n.Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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