Question

3. In an AP:
(1) given a = 5, d = 3, a = 50, find n and S.​

Answer 1

Answer:

a=5

d=3

an=50

a+(n-1)d=50

5+(n-1)3=50

(n-1)3=50-5=45

n-1=45/3

n-1=15

n=15+1

=16

Sn=n/2(a+an)

=16/2(5+50)

=8(55)

=440

Step-by-step explanation:

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