How many times does $5$ appear in all two-digit positive integers?
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Correct Answer: Option B
Detailed Explanation:
Count the digit 5 in tens place: appears in 50, 51, 52, …, 59 — that's 10 occurrences.
Count the digit 5 in units place: appears in 15, 25, 35, 45, 55, 65, 75, 85, 95 — that's 9 occurrences.
Therefore, total = 10 + 9 = 19, making Option 2 the correct answer.
Question 2 of 2 Unit Digit
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The digit in the unit place of the number $6^{129} \times 7^{307}$ is
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