Counting Numbers Containing Digit 2
XAT 2013 · Quantitative Ability & Data Interpretation · Medium · Permutations and Combinations
How many whole numbers between 100 and 800 contain the digit 2?
- A.
200
- B.
214
- C.
220
- D.
240
- E.
248
B
Explanation
Total numbers between 100 and 800 (excluding boundaries) = 699 numbers (101 to 799). For hundreds digits in {1, 3, 4, 5, 6, 7} (6 choices): Numbers NOT containing 2 = . Numbers in 101-799 with hundreds digit = 2 (200 to 299, 100 numbers): ALL contain 2. Total numbers in range = . Numbers NOT containing 2 = . Total containing digit 2 = + 1 (200 itself if range includes 200)? Let's check 101 to 799: . Non-2 numbers = . . Adding 200... wait, 214 total.
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