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If a, b and c are positive prime numbers, what is the value of a^3b^3c
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Updated on: 25 Sep 2018, 09:48
1
saurabh9gupta Prime numbers can't be negative so you can't try a negative number. I got the same answer (C) like you though. Fingers crossed for the OA. Cheers!
PS: Looked at the question again and C is a wrong answer. Answer is A.
saurabh9gupta wrote:
Bunuel wrote:
If a, b and c are prime numbers, what is the value of \(a^3b^3c^3\)?
(1) \(a^3bc = 2457\)
(2) \(b = 7\)
so we need to check whether any of the three values are positive or negative. 1. 2457 = (3)^3 * 7 * 13
a = 3 but b and c could be 7 and 13 (or vice versa) OR b and c could be -7 and -13 (or vice versa)
Not sufficient.
2. Not Sufficient
combine, we know that b and c will be positive (a definitive answer) so C
Originally posted by bebs on 25 Sep 2018, 08:09.
Last edited by bebs on 25 Sep 2018, 09:48, edited 1 time in total.
Re: If a, b and c are positive prime numbers, what is the value of a^3b^3c
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25 Sep 2018, 09:31
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Top Contributor
Bunuel wrote:
If a, b and c are prime numbers, what is the value of \(a^3b^3c^3\)?
(1) \(a^3bc = 2457\)
(2) \(b = 7\)
Target question:What is the value of a³b³c³?
Given: a, b and c are prime numbers
Statement 1: a³bc = 2457 2457 = (3)(3)(3)(7)(13) = (3³)(7)(13) So, we can be certain that a =3 From here there are two possible cases: Case a: a = 3, b = 7 and c = 13. In this case, the answer to the target question is a³b³c³ = 3³7³13³ Case b: a = 3, b = 13 and c = 7. In this case, the answer to the target question is a³b³c³ = 3³13³7³ Notice that, for each case, the answer to the target question is the SAME (i.e., 3³7³13³ = 3³13³7³) So, it must be the case that a³b³c³ = 3³7³13³ Since we can answer the target question with certainty, statement 1 is SUFFICIENT
Statement 2: b = 7 Since there's no information about a and c, there's no way to answer the target question with certainty. So, statement 2 is NOT SUFFICIENT
Re: If a, b and c are positive prime numbers, what is the value of a^3b^3c
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25 Sep 2018, 09:58
IMO answer should be A.
Statement 1 : \(a^3.b.c=2457\) On prime factorizing 2457;
\(2457 = 3^3. 17. 7\)
So we can write \(a^3bc=2457\) \(a^3.b.c\) = \(3^3. 17. 7\)
From this we can tell a = 3 and b or c = 17 or 7 We can find the value of a^3.b^3.c^3, since we don't need to know if b or c is 17 or 7. The answer will remain the same if b = 17 or 7 and same with c. Sufficient.
Statement 2: b = 7 Clearly insufficient as we do know know the values of a or c.
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