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Is the sum of 6 integers odd?

This topic has 1 expert reply and 0 member replies

Is the sum of 6 integers odd?

Post Wed Nov 08, 2017 7:31 am
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    Is the sum of 6 integers odd?

    1) The product of four largest integers is odd, and the product of two smallest integers is even

    2) the sum of two smallest integers is odd, and the sum of four largest integers is even

    The OA is B.

    Why statement 1 is not sufficient? Can any expert explain it step by step? Thanks.

    Need free GMAT or MBA advice from an expert? Register for Beat The GMAT now and post your question in these forums!
    Post Wed Nov 08, 2017 10:59 pm
    VJesus12 wrote:
    Is the sum of 6 integers odd?

    1) The product of four largest integers is odd, and the product of two smallest integers is even

    2) the sum of two smallest integers is odd, and the sum of four largest integers is even

    The OA is B.

    Why statement 1 is not sufficient? Can any expert explain it step by step? Thanks.
    The sum of 6 integers is odd if one, three, or five numbers of integers are odd.

    Question rephrased: Are there one, three, or five numbers of odd integers?

    1) The product of four largest integers is odd, and the product of two smallest integers is even.

    (i) The product of four largest integers is odd implies that all the four integers are odd.
    (ii) The product of two smallest integers is even implies that either both are even or only one is even and the other is odd.

    Thus, the number of odd integers can be four or five. No unique answer. Insufficient.

    Hope this helps!

    -Jay
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