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WBCS Preliminary Examination 2020 — General Studies · Question 176 of 200

Q176
ArithmeticNumber System, LCM/HCF & Divisibility
In writing the numbers from 10 to 100, how many times is the digit 7 used?
  1. a.20
  2. b.19
  3. c.10
  4. d.11

Answer: (B) 19

Counting occurrences of the digit 7 in the units place (17, 27, ..., 97 — 9 times) and the tens place (70-79 — 10 times) gives a total of 19.

Q175 Whole paperQ177