Question

What is the unit digit of sum of the first 111 whole number?

Answer 1

it is 6216
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Answer 2

Answer:

Ans is 5.

Step-by-step explanation:

First 111 whole number means 110

then

formula is (n(n+1))/2

here n = 110

therefore    (110(110+1))/2

                   (110 * 111)/2

                     12210/2 =  6105       hence unit digit is 5.