How many three-digit numbers from 100 to 999 both inclusive have the middle digit which is the average of the other two?
a)50 b)45 c)41 d)25
Answers
Answered by
3
Answer:
༺☞For finding total number of any n digit whole number, we have 2 method
❥(1) Highest number method
❥(2)Smallest number method
❥In HNM we take the highest number of given n digit number subtract by highest number of (n-1)digit number.
❥In SNM we take smallest number of (n+1)digit number and substract by smallest number of n digit number.
❥Similarlly here required 3 digit number.
❥So first HNM, n digit highest number is 999
❥And highest number of (n-1) digit is 99
❥Substract 99 from 999 we get 900(total 3 digit number present)
❥Now SNM, (n+1) digit smallest number is 1000
❥And smallest number of n digit is 100
❥Now substract 100 from 1000 we get 900 also.꧂
Step-by-step explanation:
PLEASE DON'T DELETE MY ANSWERS ☹️
Similar questions