27. The sum of first 25 terms of an AP is 1700. If the first term is 8, find the common difference.
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Answer:
sn=1700
a=8
sn=n/2(2a+(n-1)d)
1700=25/2(2(8)+(25-1)d)
1700×2/25=18+24d
3400/25=18+24d
136-18=24d
118=24d
118/24=d
4.91=d
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