Question

How many keystrokes are needed to type a number from $1$ to $800$ on a standard keyboard?

• A. $1200$
• B. $1326$
• C. $1182$
• D. None of these

Answer 1

The correct option is D None of these

There are $9$ one -digit numbers,

Thus, keys pressed $=9\times 1$

$=9$

There are $90$ two digit numbers,

Thus, keys pressed $=90\times 2$

$=180$

There are $701$ three -digit numbers,

Thus, keys pressed $=701\times 3$

$=2103$

$\therefore$ To type a number from $1$ to $800$,

Keystroke needed $=9+180+2103$

$=2292$

Hence, D is correct option.