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Q: How many total tens digit in the calculation from series 1 to 99?
  • A. 98
  • B. 90
  • C. 99
  • D. 100
Correct Answer: Option B - The number of tens digit from 1 to 10 = 1 The number of tens digit from 11 to 90 = 80 The number of tens digit from 91 to 99 = 9 Hence, the total number of tens from series 1 to 99 = 1 + 80 + 9 = 90
B. The number of tens digit from 1 to 10 = 1 The number of tens digit from 11 to 90 = 80 The number of tens digit from 91 to 99 = 9 Hence, the total number of tens from series 1 to 99 = 1 + 80 + 9 = 90

Explanations:

The number of tens digit from 1 to 10 = 1 The number of tens digit from 11 to 90 = 80 The number of tens digit from 91 to 99 = 9 Hence, the total number of tens from series 1 to 99 = 1 + 80 + 9 = 90