A four- digit number ( with no repetitions) is to be formed from the set of number ( 0,1,2,3,4,5,6,7). Find the probability that the number :
a) is even

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You first find the number of four-digit numbers that may be formed from the above set.

Think of it this way, pick the numbers from right to left, least significant first.

Can you do that? \[8P4 \] But there is somethingâ€”we can't place a zero.

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