Que: Find the number of keystrokes required to type numbers from 100 to 1000?

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Que: Find the number of keystrokes required to type numbers from 100 to 1000?

(A) 2,700
(B) 2,701
(C) 2,703
(D) 2,704
(E) 3,604

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Solution: The number range is from 100 to 1000.

=> Three digit numbers = 100 to 999 [Will need 3 key stroke each] = 900 * 3 = 2700 key strokes

=> Four digit number = 1000 [Will need 4 key stroke] = 4 = 4 key strokes

=> Total keystrokes = 2700 + 4 = 2704

Therefore, A is the correct answer.

Answer A