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#1 2009-10-11 21:02:24
- soha
- Real Member
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Arithmetic Progression sum
Try solving these:-
1) Find the sum of the
a) first 11 terms of AP 2, 6, 10...
b) first 13 terms of the AP -6, 0,6,...
c) first 51 terms of the AP whose second term is 2 and fourth term is 8.
2) Evaluate S12 for arithmetic sequence...
-9,-5,-1,3,7.......
"Let us realize that: the privilege to work is a gift, the power to work is a blessing, the love of work is success!"
- David O. McKay
#2 2009-10-12 08:41:01
- bobbym
- Administrator
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Re: Arithmetic Progression sum
Hi soha;
By the formula:
Where
Sn = sum to n terms
n is the number of terms
d = constant difference
s1= first term
a)
Formula:
b)
c)
s2 = 2 and s4 = 8 Add them both up and divide by 2 to get 5. This gives you a constant term of 3 (5-2 = 3 , 8 - 5 = 3)
The sequence is:
-1,2,5,8,11...
Glad to help ya!!!
Last edited by bobbym (2009-10-12 09:08:21)
In mathematics, you don't understand things. You just get used to them.
Probability is the most important concept in modern science, especially as nobody has the slightest notion what it means.
90% of mathematicians do not understand 90% of currently published mathematics.
#3 2009-10-12 18:48:03
- soha
- Real Member
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Re: Arithmetic Progression sum
Yippee!!!! Right!!!
"Let us realize that: the privilege to work is a gift, the power to work is a blessing, the love of work is success!"
- David O. McKay