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How many different 7-digit numbers exist in all?

A90,00,000
B9,00,000
C99,99,999
D1,00,00,000
Answer & Solution
Correct answer: A. 90,00,000
They run from 10,00,000 to 99,99,999, and 99,99,999 minus 10,00,000 plus 1 is 90,00,000.
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