SATHEE: Permutations And Combinations Question 271

Permutations And Combinations Question 271

Question: How many numbers lying between 500 and 600 can be formed with the help of the digits 1, 2, 3, 4, 5, 6 when the digits are not to be repeated

Options:

A) 20

B) 40

C) 60

D) 80

Show Answer

Answer:

Correct Answer: A

Solution:

There must be 5 at hundred place, now 2 numbers to be chosen from 5 numbers $ i.e. $ , $ ^{5}P_2=5\times 4=20 $ .

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Permutations And Combinations Question 271

Question: How many numbers lying between 500 and 600 can be formed with the help of the digits 1, 2, 3, 4, 5, 6 when the digits are not to be repeated

Options:

Answer:

Solution:

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