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...
"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
By the formula:
Sn = sum to n terms
n is the number of terms
d = constant difference
s1= first term
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:
Glad to help ya!!!
Last edited by bobbym (2009-10-11 10:08:21)
In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.