(1 +x) n के विस्तार में दूसरे‚ तीसरे और चौथे पदों के गुणांक समान्तर श्रेणी में है‚ n का मान है In the expansion of (1 +x) n, the coefficients of second, third and fourth term are in parallel series. The value of n is

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(1 +x) <sup>n </sup>के विस्तार में दूसरे‚ तीसरे और चौथे पदों के गुणांक समान्तर श्रेणी में है‚ n का मान है In the expansion of (1 +x) <sup>n</sup>, the coefficients of second, third and fourth term are in parallel series. The value of n is