How many times the keys of a typewriter have to be pressed in order to write numbers from 121 to 1346?
A) 3675 B) 4018 C) 4021 D) 4025
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Answer:
4025
Step-by-step explanation:
3 digit numbers : 121 to 999
____________________________
Total number of 3 digit numbers from
121 to 999 (both included)=
(999-121)+1=879 3-digit numbers
879*3=2637 digits
4 digit numbers 1000 to 1346 :
_______________________________
Total number of 4 digits from
1000 to 1346 (both included)=
(1346-1000)+1=347 4-digit numbers
347*4=1388 digits
Total : 2637 digits +1388 digits=4025
Answer : 4025.
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