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a. In how many ways can we form 8-digit ...

a. In how many ways can we form 8-digit numbers from the ditigs 0,1,2,3,4,5,6,7? (Repitition not allowed).
b How many of these are even?
c. How many of these are divisible by 25?
e. Find the number of integers greater than 7000 that can be formed with the digit 3, 5,7,8 and 9, no digit is being repeated.

Text Solution

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The correct Answer is:
a. `7xx7!` b. `7!+18xx6!` (c) `10xx5!` d. 2661 e. 190
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