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Q.

How many different non-digit numbers can be formed from the digits of the number 223355888 by rearrangement of the digits so that the odd digits occupy even places?

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a

16

b

36

c

60

d

180

answer is C.

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Detailed Solution

In a nine digits number, there are four even places for the four odd digits 3, 3, 5, 5..'. Required number of ways =4!2!2!⋅5!2!3!=60
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