Question

The sum of 8 terms of A.P 1,3,5,7.....is​

Answer 1

Answer:

64

Step-by-step explanation:

in the following AP,

a = 1, d = 3-1 = 2 and n = number of terms = 8

sum of 8 terms = n/2(2a + (n-1)d)

now,substituting the values of a,dand n in the following AP, we get

sum of 8 terms = 8/2(2×1 + (8-1)×2)

= 4(2 + (7×2)) = 4(2+14) = 4×16 = 64