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A spinner divided into equal sections numbered 0 through 8 is spun 3
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27 Jul 2022, 01:55
27 Jul 2022, 01:55
Expert Reply
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Question Stats:
75% (01:33) correct
25% (01:21) wrong based on 4 sessions
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A spinner divided into equal sections numbered 0 through 8 is spun 3 times. What is the probability that the spinner lands on a prime number all three times?
A. 16/81
B. 8/9
C. 25/81
D. 36/81
E. 10/9
A. 16/81
B. 8/9
C. 25/81
D. 36/81
E. 10/9
Part of the project: GRE QCQ & PS 3 Questions Every One DAILY Challenge - (2022)
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GRE Math Essentials (2022)
GRE Geometry Formulas for a Q170
GRE - Math Book
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GRE Math Essentials (2022)
GRE Geometry Formulas for a Q170
GRE - Math Book
A spinner divided into equal sections numbered 0 through 8 is spun 3
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27 Jul 2022, 14:14
27 Jul 2022, 14:14
Expert Reply
OE
Quote:
Well, 0 is not prime, and neither is 1, which leaves 4 prime number possibilities of the 9 total. Since the spins are independent events, multiply the chances of the prime numbers together:4/9*4/9*4/9=16/81
Of course the other answer choices represent what happens if you miscount primes or add instead of multiply. Evil! (Although if you really just had to guess, you could at least eliminate E as being greater than the maximum probability of 1.)
Of course the other answer choices represent what happens if you miscount primes or add instead of multiply. Evil! (Although if you really just had to guess, you could at least eliminate E as being greater than the maximum probability of 1.)
Re: A spinner divided into equal sections numbered 0 through 8 is spun 3
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04 Aug 2022, 14:38
04 Aug 2022, 14:38
1
But you spin it three times, in the above you only multiplied 4/9 it twice. Shouldn't it be multiplied thrice?
