From 52 cards, P(draw spade OR ace) is
A1/13
B1/4
C5/13
D4/13
Answer & Solution
Correct answer: D. 4/13
1. P(spade) = 13/52 = 1/4; P(ace) = 4/52 = 1/13.
2. P(spade and ace) = 1/52 (the ace of spades).
3. P(spade or ace) = 1/4 + 1/13 - 1/52.
4. = 13/52 + 4/52 - 1/52 = 16/52 = 4/13.
_Source: ICAI BoS Foundation Paper 3, Ch 15 'Probability', p.9_
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