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Given a = 8, an = 62, Sn = 210, find n and d.

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asked Mar 14, 2018 in Mathematics by paayal (26,720 points) ● 4 ● 6 ● 11

Given a = 8, an = 62, Sn = 210, find n and d,

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answered Mar 14, 2018 by sanjaydas (61,430 points) ● 5 ● 7 ● 7
selected Mar 15, 2018 by faiz
 
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Solution: Sn = 210 =n/2(8+62)

➪ 35n = 210

➪ n = 210/35 =6

Now, 62 =8 + 5d

➪5d =62 -8 = 54

➪d =54/5 =10.8

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