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If K is a positive 3-digit integer, is K prime?

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If K is a positive 3-digit integer, is K prime?  [#permalink]

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New post 11 Oct 2018, 00:42
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A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

64% (01:16) correct 36% (01:22) wrong based on 28 sessions

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If K is a positive 3-digit integer, is K prime?

(1) The last digit of K is not even
(2) K is the smallest number possible where the hundreds digit is the sum of the tens and units digit. Tens and units digits are equal.
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Re: If K is a positive 3-digit integer, is K prime?  [#permalink]

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New post 11 Oct 2018, 09:05
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rencsee wrote:
If K is a positive 3-digit integer, is K prime?

(1) The last digit of K is not even
(2) K is the smallest number possible where the hundreds digit is the sum of the tens and units digit. Tens and units digits are equal.


Question: is K prime?

Statement 1: The last digit of K is not even

If the unit digit of any number is Odd then the number may or may NOT be a prime number hence

NOT SUFFICIENT

STatement 2: K is the smallest number possible where the hundreds digit is the sum of the tens and units digit. Tens and units digits are equal.

Such a number will 211 which is a prime number (We don't need to know this for DS question because we know that we can figure out whether or not is it prime)

SUFFICIENT

Answer: Option B
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Re: If K is a positive 3-digit integer, is K prime?   [#permalink] 11 Oct 2018, 09:05
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If K is a positive 3-digit integer, is K prime?

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