Question

(vii) given a=8, a = 62, S = 210, find n and d.
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Answer 1

Answer:

hi !

I can give your answer because it's very easy.....

Answer 2

Answer:

Sn=210

n/2(a+l)=210

n/2(8+62)=210

n(70)=210×2

n=210×2/70

n=3×2

n=6

an=62

an=a+(n-1)d

62=8+(6-1)d

62=8+5d

62-8=5d

54=5d

d=54/5

I hope this helps you