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Question : How many 100-digit positive numbers are there?

Option 1: $9×10^{99}$

Option 2: $9×10^{100}$

Option 3: $10100$

Option 4: $11×10^{98}$


Team Careers360 14th Jan, 2024
Answer (1)
Team Careers360 16th Jan, 2024

Correct Answer: $9×10^{99}$


Solution : In any 100-digit number, the first digit cannot be 0. It will be a number from 1 to 9. The next digits can be any digit from 0 to 9.
Number of 100-digit positive numbers
= 9 × 10 × 10 × 10 ……………10 (99 times)
= $9 × 10^{99}$
Hence, the correct answer is $9 × 10^{99}$.

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