Math, asked by yishu52, 1 year ago

given a=8 an=62 sn=210 find n and d

Answers

Answered by Anonymous
42
hey mate your answer is in image and first you use the formula of Sn=n/2(a+an) and you get n=6 then you use the formula of an =a+(n-1)d then you get d=54/5.
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Answered by Panzer786
15
Heya !!






First term ( A ) = 8





Last term ( An ) = 62











Sn = 210


N/2 × ( A + L ) = 210





N/2 × ( 8 + 62 ) = 210






N/2 × 70 = 210




N = 210/35


N = 6




Number of terms = 6





An = 62




A + ( N - 1 ) × D = 62




8 + ( 6 - 1 ) × D = 62




8 + 5D = 62





5D = 62 - 8




D = 54/5



Common difference ( D ) = 54/5.


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