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Bunuel
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Bunuel
The numbers 1, 3, 5, … , 25 are multiplied together. The numbers of zeros at the right end of the product is:

(A) 0
(B) 1
(C) 2
(D) 3
(E) 4

IMO the answer is option A
because if we need a zero in the product we need 2*5=10

Since there is no even number and all are odd. it will end up in the product having an odd units place which means no zero at the right end.
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Odd*odd will always yield odd.

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No even number to pair with 5 or multiple to create 0s at the end of product value

Answer is A - 0
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Bunuel
The numbers 1, 3, 5, … , 25 are multiplied together. The numbers of zeros at the right end of the product is:

(A) 0
(B) 1
(C) 2
(D) 3
(E) 4
Solution:

The rule is that there will be one additional zero at the right end of the product for each time that 10 appears as a factor in the multiplication. For example, 37 x 10 = 370. There is one factor of 10, and thus there is one zero at the right end of the product. Also note that if there is a “5-and-2 pair” in the multiplication, then an identical result will occur, as in: 2 x 29 x 5 = 29 x 10 = 290. Each 5-and-2 pair creates a factor of 10.

Because we are multiplying only the odd numbers 1, 3, 5, 7, … , 25, we see that, while there are several occurrences of 5, there are no occurrences of the even number 2, and thus there are no 5-and-2 pairs. Thus, there are no zeros at the right end of the product.

Answer: A
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