Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫  π  -¹ ² ³ °

You are not logged in.

#1 Re: Puzzles and Games » Let's make triangular numbers. » 2011-03-22 13:58:55

136.........1, 3 & 6 are first 3 triangle numbers.

#2 Help Me ! » When will bomb explode? » 2011-03-08 01:10:07

G-man
Replies: 2

Someone planted a bomb that will surely explode. Logically people will say that the bomb has far higher chances of explosion within an hour after planting compared to an hour 10 years later (if it didn't explode before). What does maths say about this.

55..........

#5 Re: Puzzles and Games » Let's make triangular numbers. » 2011-03-02 15:53:48

36
square of product of first two consecutive primes.

#8 Re: Puzzles and Games » Let's make triangular numbers. » 2011-03-02 05:17:16

6  Its triangular & first composite which isn't a square.

#9 Re: Ganesh's Puzzles » Ration, Proportions, Work, Manpower » 2011-02-28 20:11:42

#3 isn't a valid problem because the ratio of the final mixture Should be between 3:1 & 5:1.
Still I calculated this.

#10 Re: Ganesh's Puzzles » Mathematical Induction » 2011-02-28 19:38:07

ganesh wrote:

MI # 1

Prove that the sum of n terms of
1*1! + 2*2! + 3.3! + 4*4!+.....n*(n+1)!
is (n+1)!-1.

You wrote n=1 instead of n

Let f(n)donate the series (|Last term is n*n!).

The statement is true for some p.

#13 Re: Ganesh's Puzzles » Probability and Statistics » 2011-02-28 17:42:16

If I'm not wrong.
Answer to question in first post.

#14 Re: Ganesh's Puzzles » Average » 2011-02-28 17:34:15

[hide=A's weight]85kg[hide/]

#15 Puzzles and Games » Gold distribution. » 2011-02-28 17:22:34

G-man
Replies: 1

I & my friend met an interesting man. After talking, We shared our food.
I had 6 sandwiches & my friend had 5. All of us shared equally.
After eating, the man gave us 11 gold coins.
How much should each of us get & why?