Question

The Sum of the first
11 terms of the

A.P. 3, 8, 13....is​

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Given :-

• An ap 3, 8, 13.......

To Find :-

• Sum of 1st 11 terms of the ap.

Answer :-

first term, a = 3

second term = 8

common difference, d = 2nd term - 1st term

=> 8 - 3

=> 5

Sum of n terms of the ap is

$\frac{n}{2} (2a + (n - 1)d)$

$= > \frac{11}{2} (2 \times 3 + (11 - 1)5)$

$= > \frac{11}{2} (6 + 50)$

$= > \frac{11}{2} \times 56$

$= > 11 \times 28$

$= > 308$

Hence, sum of 11 terms of the ap is 308.