How many plates of vehicles consisting of 4 different digits can be made out of the integer 4,5,6,7,8,9? How many of these number are divisible by 2.
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Multiplication principle of permutations states that if one thing can be done in m ways and the other thing can be done in n ways, total number of ways is m× n. Therefore, 360 plates of vehicles consisting 4 different digits can be made out of the given 6 numbers.
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