Question

How many keystrokes would it requires to type numbers from 1 to 100

Answer 1

Answer:

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Explanation:

There are 90 two-digit numbers, from 10 to 99. Each of these numbers requires 2 keystrokes. Therefore, one requires 180 keystrokes to type the 2 digit numbers. There are 900 three-digit numbers, from 100 to 999.

Answer 2

Answer:

192 keystrokes

Explanation:

To type the one digit numbers {1to9}, we need 9 keystrokes

To type 2 digit numbers{10-99,90 numbers} we need 90×2=180 keystrokes

To type the last number, 100, which is a 3 digit number, we of course need 3 strokes.

All these numbers, i.e 9, 180, and 3 add to give 192

Or,

9+180+3=1192 keystrokes