How many even numbers of 4 digit can be formed with the digits 2 3 5 7 9 when repetition is not allowed?
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thousands place can be occupied by all the numbers=5
hundreds place can be occupied by all the numbers=5
tens place can be occupied by all the numbers=5
but ones place can be occupied by only 2 for the number to be even
therefore number of word possible=5*5*5*1=125
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