how many 7-digit number are there in all?
how many 7 digit number are there in all
Answers
Answer:
9000000
Step-by-step explanation:
for 7 Digits Numbers
1st digit can be from 1 to 9
then second to sixth Digits can be from 0 to 9
so total 7 digits number are
= 9 * (10)⁶
= 9000000
Number will be from
1000000 to 9999999
Simple way to find is 9999999 - 1000000 + 1
=9000000
Answer:
There are 9000000 seven digit numbers
Step-by-step explanation:
Each place of a 7 digit number can be
filled by any one of the digits 0,1,2,3,4,5,6,7,8,9 except the 1000000's place.
1000000's place can be filled any one of the digits from 1 to 9 in 9 ways
100000's place can be filled any one of the digits from 0 to 9 in 10 ways
10000's place can be filled any one of the digits from 0 to 9 in 10 ways
1000's place can be filled any one of the digits from 0 to 9 in 10 ways
100's place can be filled any one of the digits from 0 to 9 in 10 ways
10's place can be filled any one of the digits from 0 to 9 in 10 ways
1's place can be filled any one of the digits from 0 to 9 in 10 ways
By principle of multiplication,
Total number of 7 digits formed
= 9*10*10*10*10*10*10
= 9000000
