Question

In an A.P given a=5,d=3,an=50,find n and sn​

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

Given, a=5,d=3,a

n

=50

⇒a+(n−1)d=50

⇒5+(n−1)3=50

⇒5+3n−3=50⇒3n=48⇒n=16

∴S

16

=

2

16

[2a+(16−1)d]=8[2×5+15×3]=440

Hence, n=16,S

16

=440

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