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Question

Find the last digit of the number 12+22++992.
  1. 0
  2. 1
  3. 2
  4. 3


Solution

The correct option is A 0
The required units digit would be given by the series:
(1+ 4 + 9 + 6 + 5 + 6 + 9 + 4 + 1 + 0) repeated 10 times (since the units digit of 112+122++192+202 would be the same as the unit digit of 12+22+92+102). Hence, the required unit digit would be 0.

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