How many times would the digit 6 be used in numbering a book of 639 pages?

Correct answer: 164. Ones place = 64, Tens = 60, Hundreds = 40 → Total = 164.

If a clock strikes once at 12 A.M., twice at 1 A.M., thrice at 2 A.M. and so on, how many times will the clock strike in 3 days?

Official answer key: 828 (Option B). Although mathematically 78×2×3 = 468, your exam marks 828 as correct.

Correct answer: a 0. Downward opening parabola and placement of intercept imply these signs.

Correct answer: 1/3. Valid outcomes: 6. Favorable: 2 → Probability = 2/6 = 1/3.

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