TS ICET 23 May 2018 Shift 2 Paper

Question : 130 of 200

Marks: +1, -0

The coefficient of

x^{n-1}

in the product (x+1)(x+2)(x+3).......(x+n) is

Solution:

The coefficient of xn–1 in the product is

1 + 2 + 3 + 4 …….. + n

=\;{ n ( n +1)}/{2}

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