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The function f(x) represents the number of ways that prime numbers can

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The function f(x) represents the number of ways that prime numbers can  [#permalink]

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New post 08 Jul 2016, 20:48
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The function f(x) represents the number of ways that prime numbers can be uniquely summed to form a certain number x such that x = a + b + c + d… where those summed variables are each prime and a ≤ b ≤ c ≤ d ... For instance f(8) = 3 and the unique ways are 2 + 2 + 2 + 2 and 2 + 3 + 3 and 3 + 5. What is f(12)?

A. 4
B. 5
C. 6
D. 7
E. 8
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Re: The function f(x) represents the number of ways that prime numbers can  [#permalink]

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New post 08 Jul 2016, 21:21
1
It is better to start with 2 and check whether sum of two primes is primes is even.

1) 2(6 times)
2) 2(3 times) + 3(2 times)
3) 2(2 times) + 3 + 5
4) 2 + 3 + 7
5) 2 + 5 + 5
6) 3(4 times)
7) 5 + 7

Answer: D
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Re: The function f(x) represents the number of ways that prime numbers can  [#permalink]

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New post 12 Oct 2018, 07:08
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Re: The function f(x) represents the number of ways that prime numbers can   [#permalink] 12 Oct 2018, 07:08
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The function f(x) represents the number of ways that prime numbers can

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