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BITSAT 2020

Exam: BITSAT
Year: 2020
Subject: Mathematics
Chapter: Permutation and Combination

BITSAT 2020 · Mathematics · Permutation and Combination

Total number of ways of selecting 2 white squares on a normal chess...

Total number of ways of selecting 2 white squares on a normal chess board if the squares are not from the same row or column is equal to

Options

A480
B496
C412
D400

Correct answer

D. 400

Step-by-step solution

2 white squares can be selected in

{ }^{32} \mathrm{C}_{2}

ways If they belong to some row or same column then

2 \left(8 \cdot{ }^{4} \mathrm{C}_{2}\right) ways.

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