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BITSAT Mathematics Permutation Combination 2020 BITSAT 2020

BITSAT Mathematics Question (2020) — Solution

Question

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

  1. A. 480
  2. B. 496
  3. C. 412
  4. D. 400

Answer

D. 400

Step-by-step solution

2 white squares can be selected in ^ 32 C _ 2 ways If they belong to some row or same column then 2 (8 ^ 4 C _ 2 ) ways.

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