Question : How many numbers are there from 400 to 700 in which the digit 6 occurs exactly twice?
Option 1: 19
Option 2: 18
Option 3: 21
Option 4: 20
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Correct Answer: 20
Solution : Given: The numbers are there from 400 to 700. In 400 – 500 ⇒ 466 = 1 time In 500 – 600 ⇒ 566 = 1 time In 600 – 700 ⇒ 9 times ⇒ 660, 661, 662, 663, 664, 665, 667, 668, 669 Again, 9 times = 606, 616, 626, 636, 646, 656, 676, 686, 696 The numbers from 400 to 700 in which the digit 6 occurs exactly twice = 1 + 1 + 9 + 9 = 20. Hence, the correct answer is 20.
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