Inspired by Nihar and Sandeep

Discrete Mathematics Level 2

When a non-negative integer \(x\) is divided by 5, we get a remainder \(y\) such that the number \(x\) can be represented as \(x=q×5+y\). For an explicit example if \(x=41\), then we have \(x=8×5+1\). And note that the remainder, here, is 1.

If I give you three chances to enter the integer \(y\), what is the probability that you will get the qu​estion right on the third attempt?


  • You will have to come up with a valid option (a possible remainder which we get after division by 5) each time you enter an integer.

  • The remainder is defined being bounded in the interval \([0, 5)\)


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