Question

what is sum of first 35 terms in the series 7+9+11...

a.39
b.1399
c.1645
d.1435

Answer 1

d is the answer. 75 is the 35th tirm.

Answer 2

term

Answer 3

Here, a = 7, d = 9 - 7 = 2

So given to find the sum of 35 terms, hence n = 35

Last term (l) = a + (n - 1)d = 7 + (35 - 1)(2) = 7 + 68 = 75
So, l = 75
Use :\[Sum = n(a + l)/2\]

Sum = 35(7 + 75)/2 = (35*82)/2 = 35*41

So, the sum is : 1435 is the answer...(D)