Questions
The number of five-digit numbers that contain 7 exactly once is
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a
(41) 93
b
(37) 93
c
(7) 94
d
(41) 94
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Correct option is A
If 7 is used at first place, the number of numbers is 94 and for any other four places it is 4×8 x 93.the total number of ways = 93(9+32)=41(93)Similar Questions
If then equal to
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