Question

If 1st term of a series is 7 and 13th term is 35.find the sum of 13 terms of the sequence

Answer 1

Answer:

Step-by-step explanation:

Answer 2

Given,

The first term of the series = 7

The 13th term of the series = 35

To Find,

The sum of the first 13 terms of the sequence.

Solution,

The given sequence is an A.P

where

a = 7

a₁₃ = 35

The formula for calculating the sum of the first 13 terms will be

S = n/2(a+a₁₃)

S = 13/2(7+35)

S = 13/2(42)

S = 13*21

S = 273

Hence, the sum of the first 13 terms of the sequence is 273.