Question

For an A.P. a = 8, an = 62 and Sn = 210. Find n and d. ​

Answer 1

Given, a=8, an=62, Sn=210
We know, Sn=(an+a)n/2
=>210=(62+8)n/2
=>210=70n/2
=>3=n/2
=>n=6
a6=a+5d
=>62=8+5d
=>5d=54
=>d=10.8
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