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Re: Least prime factor of (7! + 7) [#permalink]
1
Sonalika42 wrote:
Quantity A
Quantity B
Least prime factor of (7! + 7)
Greatest prime factor of 7!





A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.


Quantity A: Least prime factor of (7! + 7)
7! + 7 = 7(6! + 1)
= 7(6 x 5 x 4 x 3 x 2 x 1 + 1)
= 7(720 + 1)
= (7)(721)
= (7)(7)(103)
Since 103 is prime, the least prime factor is 7


Quantity B: Greatest prime factor of 7!
7! = (7)(6)(5)(4)(3)(2)(1)
= (7)(2)(3)(5)(2)(2)(3)(2)(1)
The greatest prime factor is 7

So...
Quantity A: 7
Quantity B: 7

Answer:
Show: ::
C


Cheers,
Brent
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Re: Least prime factor of (7! + 7) [#permalink]
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Re: Least prime factor of (7! + 7) [#permalink]
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