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a
n+19
b
n+20
c
n+21
d
n+22
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Correct option is B
Ar=a+rb−an+1⇒A10=n+103n−2−nn+1=n+20Similar Questions
Between 1 and 31 are inserted M arithmetic means so that the ratio of the 7th and (M - 1) th means is 5:9, then the value of m is
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