Math, asked by rejaniniranya, 19 days ago

The eight term of an arithmetic sequence is 40 calculate the sum of first 15 term

Answers

Answered by joshiarun108

1

Answer:

600

Step-by-step explanation:

a8= 40

a+(8-1)d = 40

a+7d = 40 1

NOW

n= 15

s15= 15/2[2a+(15-1)d]

s15 = 15/2[2a + 14d]

s15 = 15/2 × 2 [2a + 7d]

s15 = 15× 40. from 1

s15 = 600

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