Permutation: n Different Things Taken All at a Time When All Are Not Different.
How many diff...
Question
How many different nine-digit numbers can be formed from the number 223355888 by rearranging its digits so that the odd digits occupy even positions ?
A
16
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B
36
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C
60
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D
180
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Solution
The correct option is C 60 X - X - X - X - X
The four digits 3, 3, 5, 5 can be arranged at (-) places in 4!2!2!=6 ways. The five digits 2, 2, 8, 8, 8 can be arranged at (X) place in 5!2!3!=10 ways.
Total numbers of arrangement is 6×10=60.