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  4. 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

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Q. 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

BITSATBITSAT 2020

Solution:

$2$ white squares can be selected in ${ }^{32} C_{2}$ ways If they belong to some row or same column then $2\left(8 \cdot{ }^{4} C _{2}\right)$ ways.