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Math Question of the Day Verbal Question of the Day Word of the Day Essay of the Week



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Student: 1/25/2010 1:30:10 PM
Student: 1/27/2010 2:45:57 AM
For A: n^2 is divisible by n.
For B: n/2 will be a fraction. So it can't be a prime.
(If we take only the integer part of n/2, then also this will be an even number always, so its not prime)
For C: 3n is divisible by 3 and n. So cant be prime.
For D: if n = 97 (A prime number), Then n-6 = 91 is divisible by 7 and 13.
So D cant be the option.
For E: if n=5, n^2 + 1 = 26 is divisible by 2 and 13. So this cant be prime.

Student: 1/27/2010 12:40:31 PM
The question asks you to choose an option that COULD be a prime. When doing this kind of question, pick a number to see if it makes the choice prime. It it does, even for ONCE, the answer should be this one.

The correct answer is D.

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