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If n A.M.'s are inserted between 20 and 80 such that the ratio of first mean to the last mean is 1:3, find the value of n.

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a=20= first term, l=80=last term

No. of A.M's=n

So, Total no of terms in A.P= no.of. means+one first term+one last term

N=n+2

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