How many seven digit number are there in all ??????
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Answer:
There are 90,00,000 (90 lakh) 7 digit numbers.
Step-by-step explanation:
We have 10 digit to use to make 7 digit numbers. But in first place we can not use digit 0 as if 0 is used we get 6 digit number. So, for first place we only have 9 digits and for last 6 places we have 10 digits.
Thus we get,
No of 7 digit nos = 9 × 10 × 10 × 10 × 10 × 10 × 10 = 9 × 1000000
= 9000000
Therefore, There are 90,00,000 (90 lakh) 7 digit numbers.
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