Posted by Terfa sakaa on Sunday, October 14, 2012 at 4:28am.
I assume that "a,p" stands for arithmetic progression. Let the nth term be an.
Since a4 + a6 = 2 a5, a5 = 21.
Since a3 + a9 = 2 a6, a6 = 26
The common difference is
a(n+1) - an = a6 - a5 = 5.
The first term is 1, and the progression is
a1 = 1, a2 = 6, a3 = 11, a4 = 16,
a5 = 21, a6 = 26, a7 = 31, a8 = 36,
a9 = 41, a10 = 46...
The sum of the first 10 terms is
7 + 27 + 47 + 67 + 87 = 235
Related Questions
maths - the sum of the 4th and 6th terms of an A.P is 42. the sum of the 3rd and...
Math - 1) If the sum of the first n terms of a series is Sn where Sn=2n²-n...
math - 1) If the sum of the first n terms of a series is Sn where Sn=2n²-n...
Math 12 - sum of 2nd and 5th terms of a geometric sequence is 13. the sum of ...
arithmetic - the sum of the 4th and 8th terms is 10, and the sum of the 6th and ...
Geometric - 1) The sum of last three terms of GP having n terms is 1024 time the...
arithmetic - THE SUM OF THE 2ND AND 5TH TERMS OF AN A.P IS 42. IF THE DIFFERENCE...
10th math - The sum of the 4th and 8th terms of an AP is 24 and the sum of the ...
maths - the sum of 3rd and 5th terms of an a.p is 38 and sum of 7th and 10th ...
math URGENT!!!! - i have a list of 5 different numbers. the sum of 2 of the ...
For Further Reading
