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10 Oct 2025, 00:04
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
85%
(hard)
Question Stats:
44% (01:59) correct
56%
(01:49)
wrong
based on 144
sessions
History
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If u and v are distinct prime numbers, which of the following CANNOT be a prime number?
A. uv + 3v − 2
B. uv – u + 2v − 2
C. uv + 2u – v − 2
D. uv + 3u − 2v − 6
E. uv + u + v + 1
A. uv + 3v − 2
B. uv – u + 2v − 2
C. uv + 2u – v − 2
D. uv + 3u − 2v − 6
E. uv + u + v + 1
10 Oct 2025, 01:11
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Option E cannot be prime
Let's see how
On simplifying option E, we get
(u+1)(v+1)
We only have 2 & 3 as consecutive prime numbers which can be used here but we're told that u & v are also distinct and we don't have consecutive primes other than 2 & 3.
Therefore, option E cannot be prime
Let's see how
On simplifying option E, we get
(u+1)(v+1)
We only have 2 & 3 as consecutive prime numbers which can be used here but we're told that u & v are also distinct and we don't have consecutive primes other than 2 & 3.
Therefore, option E cannot be prime
10 Oct 2025, 04:20
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Bunuel
Let’s rewrite the entire options, as it’s given the terms u and v are DISTINCT PRIME numbers.
| U=2 , v=3 | u=3, v=2 | U=3, v=5 | u=5, v=3 | |
| a) v* (u+3)-2 | 13 | 10 | 28 | 22 |
| b) (u+2)*(v-1) | 8 | 5 | 20 | 14 |
| C) (u-1)*(v+2) | 5 | 8 | 14 | 20 |
| d) (u-2)*(v+3) | 0 | 5 | 8 | 18 |
| e) (u+1)*(v+1) | 12 | 12 | 18 | 8 |
Only Option E has all the numbers as even numbers greater than 2. Hence, CANNOT BE PRIME.
