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Prime Numbers-Product of Prime Numbers Less Than 20

Discussion in 'CAT/MAT/GMAT Preparation' started by Royaluni, Sep 14, 2015.

  1. Royaluni

    Royaluni Administrator

    GMAT Practice Question-The product of all the prime numbers less than 20 is closest to which of the following powers of 10?

    A. 10 to the power of 9

    B. 10 to the power of 8

    C. 10 to the power of 7

    D. 10 to the power of 6

    E. 10 to the power of 5

    Answer. The prime numbers less than 20 are 2,3,5,7,11,13,17 and 19. Their product is 9,699,690.

    Question is not asking us to find out the exact value, so we need to do approximation, when you do that you will find this value is closest to 10*10*10*10*10*10*10, 10 to the power of 7.

    Answer choice C

    how many of the parents volunteered to bring refreshments?

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