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Re: If x equals all prime numbers that satisfy the inequality [#permalink]
is there another way to do this ? faster maybe..
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Re: If x equals all prime numbers that satisfy the inequality [#permalink]
-2,-3 and -5 are also prime numbers and satisfy the equation as they have not specified only positive integers why not take the negative as well?
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Re: If x equals all prime numbers that satisfy the inequality [#permalink]
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akshata96 wrote:
-2,-3 and -5 are also prime numbers and satisfy the equation as they have not specified only positive integers why not take the negative as well?


Prime numbers are never negative
in any case, because of mod sign the numbers will become positive
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Re: If x equals all prime numbers that satisfy the inequality [#permalink]
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Simplifying the equation will give:
x^​2+5x-50<=0
When equated to 0, the values for x will be 5 and -10.
Since prime numbers can not be negative, eliminate 10.
Now prime numbers less than 5 i.e. 2 and 3 when substituted in that equation will make it negative thereby satisfying the equation.
Hence the required values are 2, 3, and 5.
Average = 2+3+5/3= 10/3
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Re: If x equals all prime numbers that satisfy the inequality [#permalink]
why 1 is not considered? It is also a prime number
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Re: If x equals all prime numbers that satisfy the inequality [#permalink]
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Nikhil4GRE wrote:
why 1 is not considered? It is also a prime number


1 is neither prime nor composite

Prime numbers have exactly 2 positive integer factors

Composite numbers have more than 2 positive integer factors

1 has only one factor

So neither prime nor composite
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Re: If x equals all prime numbers that satisfy the inequality [#permalink]
Hello from the GRE Prep Club BumpBot!

Thanks to another GRE Prep Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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