Question

The first and the last terms of an AP are 5 and 45 respectively. If the

sum of all its terms is 400, find its common difference?​

Answer 1

Answer:

a=5

an=45

Sn= 400

d=?

Sn=n/2[a+an]

400=n/2[5+45]

n=16

an=a+(n-1)d

d=8/3

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