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प्रश्न
How many 7-digit numbers are there in all?
योग
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उत्तर
The largest seven-digit number = 9999999
The smallest seven-digit number = 1000000
Number of all seven-digits numbers = (9999999 − 1000000) + 1
= 899999 + 1
= 9000000
Hence, there is a total of ninety lakh 7-digit numbers.
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