Question

The 15 th term of an ap is 40. What is the sum of 14 and 16 term

Answer 1

Answer:

520

Step-by-step explanation:

Let the first term be a and common difference is d,

a+(7−1)d=40

a+6d=40

Now sum of 13 term is

2

13

(2a+12d)=

2

13

.2.40=520

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