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multiple of 9 proves

by sanju09 » Sat Jun 28, 2014 1:49 am
"2 more than an odd multiple of 9 is a prime."

Which of the following multiple of 9 proves the above statement wrong?
(A) First
(B) Third
(C) Fifth
(D) Seventh
(E) Ninth


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by GMATinsight » Sat Jun 28, 2014 9:06 am
Option: D
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by Brent@GMATPrepNow » Sat Jun 28, 2014 2:41 pm
sanju09 wrote:"2 more than an odd multiple of 9 is a prime."

Which of the following multiple of 9 proves the above statement WRONG?
(A) First
(B) Third
(C) Fifth
(D) Seventh
(E) Ninth
(A) First: (1)(9) + 2 = 11. 11 is PRIME, so KEEP A
(B) Third: (3)(9) + 2 = 29. 29 is PRIME, so KEEP B
(C) Fifth: (5)(9) + 2 = 47. 47 is PRIME, so KEEP C
(D) Seventh: (7)(9) + 2 = 11. 65 is NOT PRIME, so the answer is D
(E) Ninth

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by [email protected] » Sat Jun 28, 2014 11:15 pm
D

sanju09 wrote:"2 more than an odd multiple of 9 is a prime."

Which of the following multiple of 9 proves the above statement wrong?
(A) First
(B) Third
(C) Fifth
(D) Seventh
(E) Ninth


Made Up!
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by sanju09 » Fri Jul 04, 2014 10:28 pm
Brent@GMATPrepNow wrote:
sanju09 wrote:"2 more than an odd multiple of 9 is a prime."

Which of the following multiple of 9 proves the above statement WRONG?
(A) First
(B) Third
(C) Fifth
(D) Seventh
(E) Ninth
(A) First: (1)(9) + 2 = 11. 11 is PRIME, so KEEP A
(B) Third: (3)(9) + 2 = 29. 29 is PRIME, so KEEP B
(C) Fifth: (5)(9) + 2 = 47. 47 is PRIME, so KEEP C
(D) Seventh: (7)(9) + 2 = 11 (oops!). 65 is NOT PRIME, so the answer is D
(E) Ninth

Cheers,
Brent


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