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30 Dec 2021, 06:30
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
76% (01:50) correct
24%
(01:59)
wrong
based on 105
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Two cards are drawn at a random from a pack of 52 cards. What is the probability that one of them is a Jack card and the other is a an Ace card?
A) 1/4
B) 8/663
C) 1/16
D) 2/15
E) 1/125
A) 1/4
B) 8/663
C) 1/16
D) 2/15
E) 1/125
30 Dec 2021, 12:21
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Bunuel
Total probability = 52C2
No of ways one jack can be selected = 4C1 |there are four jacks in a deck of cards
No of ways on ace can be selected = 4C1 |there are four aces in a deck of cards.
So the probability of drawing a jack and an ace = 4C1*4C1/52C2
16/26*51 = 8/663 B
30 Dec 2021, 23:11
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Total Cards- 52
Total Jacks -4
Total Ace -4
Choosing two cards randomly - 52C2
Choosing one Jack and one ace - 4C1*4C1
Probability = (4C1*4C1)/52C2 =8/663
(B) is correct.
Total Jacks -4
Total Ace -4
Choosing two cards randomly - 52C2
Choosing one Jack and one ace - 4C1*4C1
Probability = (4C1*4C1)/52C2 =8/663
(B) is correct.
