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What is the unit digit of the sum of first 150 whole numbers?

  1. 9
  2. 5
  3. 0
  4. 1

Answer (Detailed Solution Below)

Option 2 : 5
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Detailed Solution

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Formula used:

Sum of N numbers starting from 1 = N(N + 1)/2

Calculations:

Whole numbers = 0, 1, 2, 3.......n

So the value of N will be 149.

Sum = (149 × 150)/2 = 149 × 75 = 11175

∴ The unit digit is 5.

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