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How many 7 digit numbers using all digit...

How many 7 digit numbers using all digits from 1, 1, 2, 2, 3, 3, 4, so that odd digit occupy the odd places :

A

16

B

18

C

21

D

24

Text Solution

Verified by Experts

The correct Answer is:
B
`(I)/(O) (II)/()(III)/(O) (IV)/()(V)/(O) (IV)/() (VII)/() : {1,1,2,2,3,3,4}`
` =((4!)/(2! xx 2!)) xx (3!)/(2!) 18`
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