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Twin primes are defined as prime numbers that can be express

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Twin primes are defined as prime numbers that can be express  [#permalink]

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New post 01 Mar 2012, 16:12
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Twin primes are defined as prime numbers that can be expressed as p and (p + 2), and any number p that is a member of such a pair is considered to “have” a twin. For example, 3 and 5 are twin primes, and 3 has a twin. Each of the following prime numbers has a twin EXCEPT

A. 7
B. 13
C. 17
D. 23
E. 29

Can someone please let me know whether my understanding is right or wrong?
Considering answer choice

A) 7 = 5 & 5+2 (Has a twin)

B) 13 = 11 & 11+2 (Has a twin)

C) 17 ---> Struggling to find a twin

D) 23 --> Struggling to find a twin

E) 20 --> Struggling to find a twin

Am I understanding the meaning of twin correctly or not?

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MGMAT 3 ---> 610
GMAT ==> 730
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Re: Twin primes are defined as prime numbers that can be express  [#permalink]

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New post 01 Mar 2012, 16:26
Twin primes are defined as prime numbers that can be expressed as p and (p + 2), and any number p that is a member of such a pair is considered to “have”a twin. For example, 3 and 5 are twin primes, and 3 has a twin. Each of the following prime numbers has a twin EXCEPT

A. 7 --> 5 is a twin prime of 7;
B. 13 --> 11 is a twin prime of 13;
C. 17 --> 19 is a twin prime of 17;
D. 23 --> neither 23-2=21 nor 23+2=25 is a prime, hence 23 has no twin prime;
E. 29 --> 31 is a twin prime of 29.

Answer: D.
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Re: Twin primes are defined as prime numbers that can be express  [#permalink]

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New post 26 Apr 2020, 03:21
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Re: Twin primes are defined as prime numbers that can be express   [#permalink] 26 Apr 2020, 03:21

Twin primes are defined as prime numbers that can be express

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