Question

What is the unit digit of sum of 1st 111 whole numbers?

Answer 1

unit digit in the sum is 5

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Answer 2

Answer:

6

Step-by-step explanation:

To Find :What is the unit digit of sum of 1st 111 whole numbers?

Solution:

First 111 whole numbers = 0,1,2,3,4,5,6,.......,110,111

Now sum of first 111 whole numbers =$\sum_{n=0}^{111} n$

$0+1+2+3+4+........+110+111$

$6216$

Unit digit is the last digit

So, the unit digit of sum of 1st 111 whole numbers is 6