Question

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

A 4 Correct Answer Incorrect Answer
B 6 Correct Answer Incorrect Answer
C 5 Correct Answer Incorrect Answer

Solution

Sum of first 11 whole numbers is 0+1+2...110 i.e n(n+1)/2 =110*111/2 =55*111 Therefore unit digit is 5

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