Find total no ways in which a black square and a white square can be selected from a chess board such that both the square lies either in same row or in same column?
a) 256
b) 512
c) 128
d) 64

• ans=(a)256
  since there are total of 8 rows and columns which starts with black n white respectively.so no. of ways to choose a black square n a white square is 4C1 each.and out of 16 rows n columns we can select either a row or column in 16C1 ways.thus, total no. of ways= 16C1*4C1*4C1=256
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