Question

find the sum of the first 23 term of an AP 7, 10.5, 14?

Answer 1

Answer:

1046.5

Step-by-step explanation:

Hi,

Given A.P is 7, 10/2, 14,......

We can clearly observe that

First Term of an A.P , a = 7

Common difference of A.P, d = 10 1/2 - 7 = 21/2 - 7 = 7/2

Sum to n terms of an A.Pis given by

S = n/2*[2a + (n-1)d]

To find the sum to 23 terms of an AP,

n = 23

So, S = 23/2[2*7 + (22)7/2]

=> S = 23/2[ 14 + 77]

=> S = 23/2*91

=> S = 2093/2 = 1046.5

Hope, it helped

Answer 2

Answer:

Step-by-step explanation: