Friday, June 15, 2007

GRE ALGEBRA QUESTION OF THE DAY

If 720 is the product of the consecutive integers
beginning with 2 and ending with n, what is the
value of n-1?
(A) 5
(B) 6
(C) 8
(D) 11
(E) 23

11 comments:

  1. its easy rakesh
    consequetive integers are denoted as
    1 2 3 4 5 6 7.....n

    since the beginning integer is 2
    and the product is given as 720

    therefore n-1 would be 5
    since 2*3=6
    6*4=24
    24*5= 120
    120*6=720
    so n is 6 therefore n-1 implies (6-1)
    =5

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  2. ya a is the correct answer and logically time saving answer is given
    720 according to condition as now see the products of it 360,240etc but
    according to condition 2 is the starting and n is ending so consider240 k and now n=0as per the 240 we have now add 2+4+0=6 k now by condition n-1 so 6-1=5.
    k its logic answer max it works in all these type of questions k

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  3. but we have to consider consecutive numbers...
    i think ans is c

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