Management Aptitude Test Sep 2020 Paper

Question : 92 of 200

Marks: +1, -0

There is a number lock with four rings. How many attempts at the maximum would have to be made before getting the right number?

Solution:

The lock contains 4 rings, so any place can have number from 0 to 9 .

∴

Total ways to getting a code

=10^{4}

∴

So, maximum attempts before getting the right number is 1 less than total ways i.e.,

10^{4}-1

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