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Re: y = (23)(24)(25)(26)(27) [#permalink]
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There's also another rule to make sure whether or not the unit digit is 0 which is called (5*2) pair. If you find one pair of 5 and 2 that means the number ends with 0 for sure!
In this question 25 and 24 provide the minimum requirement of 5*2 pair, as Brent mentioned above.
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Re: y = (23)(24)(25)(26)(27) [#permalink]
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Simply try to find a 5 and a 2 in the units digit.
We have two options here, 4*5 or 5*6, pick your jam.
Now that we have a 0, ignore everything else and just compare with the other value given.

Here, Qa=Qb ; C is the answer.
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y=23*24*25*26*27 [#permalink]
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\(y=23*24*25*26*27\)


Quantity A
Quantity B
The unit digit
0



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



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y=23*24*25*26*27 [#permalink]
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The answer is C.

y has two even numbers, so it is a multiple of 2. Y is also a multiple of 25, so it is a multiple of 5 as well. Since it is a multiple of 5*2, it has to end with a zero.
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y=23*24*25*26*27 [#permalink]
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