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Q.
How many numbers consisting of 5 digits can be formed in which the digits 3, 4 and 7 are used only once and the digit 5 is used twice
A.
30
B.
45
C.
90
D.
60
E.
None of the above
View Answer
Correct choice: D
Explanation:
Required number of ways are 5!/2!= 60.
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