SATHEE: Permutations And Combinations Question 187

Permutations And Combinations Question 187

Question: The number of numbers of 4 digits which are not divisible by 5 are

Options:

A) 7200

B) 3600

C) 14400

D) 1800

Show Answer

Answer:

Correct Answer: A

Solution:

The total number of 4 digits are $ 9999-999=9000 $ . The numbers of 4 digits number divisible by 5 are $ 90\times 20=1800 $ . Hence required number of ways are $ 9000-1800=7200 $ . {Since there are 20 numbers in each hundred (1 to 100) divisible by 5 and from 999 to 9999 there are 90 hundreds, hence the results}.

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Permutations And Combinations Question 187

Question: The number of numbers of 4 digits which are not divisible by 5 are

Options:

Answer:

Solution:

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