Question

how to solve this question:given a=8,An=62,Sn=210 ,find n and d

Answer 1

an : a+(n-1)d
62=8 + (n-1)d
54 =(n-1)d ...... 1
sn : n/2(a+l)
210 : n/2(8+62)
210: n/2 (70)
210=35n
n=6
from 1
54=(6-1)d
54=5d
d= 54/5
i hope this will help you
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