Math miscellaneousHard
Question
The number of five digit numbers that contains digit 7 exactly once is if digits may be repeated)
Options
A.(41) (93)
B.(37)(93)
C.(7) (94)
D.(41)(94)
Solution
-
∴ if 7 fill in
first place
= 32 × 93 if 7 can be
fill in any last 4
94 + (32 × 93) = 41 × 93 places
∴ if 7 fill infirst place
= 32 × 93 if 7 can befill in any last 4
94 + (32 × 93) = 41 × 93 places
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