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5 squares on a chessboard can be chosen in 64C5 ways Three squares of one colour and two squares of different colour can be chosen in two mutually exclusive ways (i) 3 white and 2 black (ii) 3 black and 2 white Thus, the favourable number of cases = 32C3 × 32C2 + 32C2 × 32C3 = 2 × 32C2 × 32C3 Required Probability = 2 × 32C2 × 32C3 / 64C5
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P and Q individually can complete the work in 36 days and 54 days respectively. If the time taken by R alone to complete the work is 1.25 times the time...
9 children can complete a piece of work in 360 days. 18 men can complete the same piece of work in 72 days and 12 women can complete the piece of work i...
P alone can finish a piece of work ‘M’ in 6 days while Q takes 3 days to finish it alone. P, Q and R working together can finish the work ‘N’ wh...
'Ankit' can complete some work alone in 35 days. 'Amit' is twice as efficient as 'Sumit' and four times as efficient as 'Ankit'. If 'Ankit' and 'Sumit' ...
