SIGN UP FOR FREE !
Home
/ Forum
User Forum
Ask Your Question
Sri Mitra
from
GIIS, Singapore
Subject :
IMO
Class :
Class 4
View All Answers (1)
Ans 1:
×
Edit Post
Post
ans a-80. From 1-9 there are 9 digits . so we are left with 151-9=142 digits. Note that from 10 onwards all numbers are of 2 digits. So there are 142/2=71 numbers to have 142 digits. Therefore there are 9+71=80 numbers.
Arundhati Sarkar
from
DPS SECTOR 45 , Gurgaon
Class :
Class 4
ans a-80. From 1-9 there are 9 digits . so we are left with 151-9=142 digits. Note that from 10 onwards all numbers are of 2 digits. So there are 142/2=71 numbers to have 142 digits. Therefore there are 9+71=80 numbers.
Submit Your Answers
Post Your Answer