A box contains 90 discs numbered 1 to 90. If one disc i... – Statistics

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A box contains 90 discs numbered 1 to 90. If one disc is drawn, what is the probability that it bears a two-digit number?

A81/90

B9/90

C10/90

D80/90

✓ Correct Answer: A — 81/90

One-digit numbers are 1 to 9 (9 numbers). Two-digit numbers = 90 - 9 = 81. 81/90 = 9/10.

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