Question : How many 100-digit positive numbers are there?
Option 1: $9×10^{99}$
Option 2: $9×10^{100}$
Option 3: $10100$
Option 4: $11×10^{98}$
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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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