Question

the first term of an ap is 5 and the last term is 45 . if the sum of all the terms is 400 the number of term is​

Answer 1

Answer:

a = 5

l = 45

Sn = 400

Sn = n / 2 (a + l)

400 = n / 2 (5 + 45)

400 = n / 2 (50)

400 = n * 25

n = 400 / 25

n = 16

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Answer 2

n = 16

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