How many 7-digit numbers are there?

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90,00,000

80,00,000

95,00,000

84,00,000

answer is A.

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Detailed Solution

Let’s find the largest and smallest 7-digit numbers.
Largest 7-digit number is 99,99,999.
Smallest 7-digit number is 10,00,000.
Now let’s calculate the total number of 7-digit numbers;
Total number of 7-digit numbers = (99,99,999 - 10,00,000) + 1
= 89,99,999 + 1
= 90,00,000
Therefore, in total there are 90,00,000 7-digit numbers.
Hence, option 1 is correct.

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