A book has 250 pages.how many digits have been used to print the page n7mbers of the book
Answers
Answer:
ANSWER IS 643 DIGITS
Step-by-step explanation:
NUMBERS OF SINGLE DIGIT WHOLE NUMBERS 0-9 i.e NUMBER OF TIMES HE HAS TO PRESS THE KEYS TO PRINT THE PAGES
= 10 * 1 = 10 DIGITS ( IT IS 10 BECAUSE THE DIFFERENCE BETWEEN ANY TWO NUMBER IS TAKEN AS DIFFERENCE OF NUMBERS + 1 EVERY TIME )
NUMBER OF TWO DIGIT NUMBERS FROM 10 TO 99
i.e NUMBER OF TIMES HE HAS TO PRESS THE KEYS TO PRINT THE PAGES = 90 * 2
= 180 DIGITS
NUMBER OF THREE DIGIT NUMBERS ARE 100 TO 250
i.e 151 * 3 = 453 DIGITS
THEREFORE 453 TIMES HE HAS TO PRESS THE DIGIT KEYS TO PRINT THREE DIGIT NUMBERS
NOW, THE TOTAL NUMBER OF TIMES HE HAS TO PRESS THE NUMBERED KEYS ALTOGTHER IS
10 + 180 + 453 DIGITS = 643
643 TIMES HE HAS TO PRESS THE NUMBERED KEYS
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Answer:
642
Step-by-step explanation:
1-9= 9
10-99 = 90
100-250= 250-(90+9)= 151
9*1+90*2+151*3= 642