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Permutations/Combinations

Expert replies
by vaibhav101 » Fri Jun 15, 2018 11:59 pm

Timer

00:00

Answers

A

B

C

D

E

Stats

Difficulty

How many numbers lying between 3000 & 4000 and which are divisible by 5 can be made with the digits 3,4,5,6,7 & 8? (digits are not to be repeated in any number).

A 11
B 12
C 13
D 14
E 8
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Source: — Problem Solving |

by Sionainn@PrincetonReview » Sat Jun 16, 2018 12:27 pm
With the restriction given, you know the number will need to be 3 __ __ 5. So you only need to find the number of possibilities for the tens digit and the hundreds digit. The only numbers still available are 4,6, 7, 8, so you have 4 options for one of the digits. Then 3 digits remain as possibilities for the other digit. Just multiply your options 4 * 3 to find the answer is 12 or B.

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