Questions
Six X’s have to be placed in squares of the figure given below, such that each row contains at least one X. The number of different ways in which this can be done is
detailed solution
Correct option is A
First Method: Number of cross marks in∴ Required number = 8 + 4 + 6 + 8 = 26Second Method:Number of ways of putting six cross marks in 8 squares when there is no restriction =8C6=28.Number of ways when the six cross marks are put in first and second rows =6C6=1.Number of ways when the six cross marks are put in second and third rows =6C6=1.∴ Required number = 28 – 2 = 26.Similar Questions
Let be a set containing elements. The number of reflexive relations that can be defined on is
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