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In an AP: (i) Given a = 5, d = 3, an = 50, find n and Sn.

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asked Mar 13, 2018 in Mathematics by paayal (26,720 points) ● 4 ● 6 ● 11
In an AP:

(i) Given a = 5, d = 3, an = 50, find n and Sn.

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answered Mar 13, 2018 by sanjaydas (61,430 points) ● 5 ● 7 ● 7
selected Mar 15, 2018 by faiz
 
Best answer

Solution: 50=5+3(n-1)

⇒3(n-1)=45

⇒n-1=15

⇒n=16

Now, Sn=16/2(5+50)=440

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