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Two stacks of ten cards each are numbered 1-10 and randomly

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Two stacks of ten cards each are numbered 1-10 and randomly [#permalink] New post 29 Oct 2017, 02:15
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Question Stats:

20% (00:14) correct 80% (00:35) wrong based on 5 sessions
Two stacks of ten cards each are numbered 1-10 and randomly shuffled. Sam has to pick the top card from each stack and guess the number on each card. What is the probability that Sam guesses both numbers correctly?

A. 0.001
B. 0.025
C. 0.01
D. 0.02
E. 0.50

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[Reveal] Spoiler: OA
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Director
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Re: Two stacks of ten cards each are numbered 1-10 and randomly [#permalink] New post 30 Oct 2017, 09:29
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The probability of correctly guessing two cards from two decks of 10 cards consequently is \(\frac{1}{10}\frac{1}{10} = \frac{1}{100} = 0.01\).

Answer C
Re: Two stacks of ten cards each are numbered 1-10 and randomly   [#permalink] 30 Oct 2017, 09:29
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Two stacks of ten cards each are numbered 1-10 and randomly

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