If n is the smallest of three consecutive positive integers, which of the following must be true?

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If n is the smallest of three consecutive positive integers, which of the following must be true?


(A) n is divisible by 3

(B) n is even

(C) n is odd

(D) (n)(n + 2) is even

(E) n(n + 1)(n + 2) is divisible by 3


OA E

Source: Manhattan Prep

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BTGmoderatorDC wrote:
Tue Dec 01, 2020 6:02 pm
If n is the smallest of three consecutive positive integers, which of the following must be true?


(A) n is divisible by 3
(B) n is even
(C) n is odd
(D) (n)(n + 2) is even
(E) n(n + 1)(n + 2) is divisible by 3


OA E

Source: Manhattan Prep
There's a nice rule says:
The product of k consecutive integers is divisible by k, k-1, k-2,...,2, and 1
So, for example, the product of any 5 consecutive integers will be divisible by 5, 4, 3, 2 and 1
Likewise, the product of any 11 consecutive integers will be divisible by 11, 10, 9, . . . 3, 2 and 1

By the above rule, the product of 3 consecutive integers will be divisible by 3, 2 and 1
Now recognize that n, n+1 and n+2 represent 3 consecutive integers
So, n(n + 1)(n + 2) must be divisible by 3

Answer: E

Cheers,
Brent
Brent Hanneson - Creator of GMATPrepNow.com
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BTGmoderatorDC wrote:
Tue Dec 01, 2020 6:02 pm
If n is the smallest of three consecutive positive integers, which of the following must be true?


(A) n is divisible by 3

(B) n is even

(C) n is odd

(D) (n)(n + 2) is even

(E) n(n + 1)(n + 2) is divisible by 3


OA E

Source: Manhattan Prep
The product of \(3\) consecutive positive integers is divisible by \(6\)

\(6=3\cdot 2\), Thus the product of \(3\) consecutive positive integers is divisible by both \(2\) and \(3\).

Therefore, E

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BTGmoderatorDC wrote:
Tue Dec 01, 2020 6:02 pm
If n is the smallest of three consecutive positive integers, which of the following must be true?


(A) n is divisible by 3

(B) n is even

(C) n is odd

(D) (n)(n + 2) is even

(E) n(n + 1)(n + 2) is divisible by 3


OA E

Solution:

Looking at the answer choices, we see that answer choice E represents the product of 3 consecutive integers, and that product is always divisible by 3! = 6, so it also must be divisible by 3.

Answer: E

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