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Q)

If the coefficients of the three successive terms in the binomial expansion of $(1+x)^n$ are in the ratio $1 : 7 : 42$, then the first of these terms in the expansion is :


( A ) $9^{th}$
( B ) $7^{th}$
( C ) $8^{th}$
( D ) $6^{th}$

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