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Bunuel
The product of the prime integers between 43 and 50, inclusive, is:

A) 50! – 40!
B) 99,029
C) 2,303
D) 2,021
E) 2,000

There are only two prime numbers between 43 and 50, inclusive; which are 43 and 47. Thus, the product of those two prime numbers is:

43 x 47 = 2,021

Answer: D
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Prime numbers between 43 and 50, inclusive: 43 and 47

It is not necessary further calculations, since 3x7 = 21.

Only option D has a number that units digit is 1.
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Bunuel
The product of the prime integers between 43 and 50, inclusive, is:

A) 50! – 40!
B) 99,029
C) 2,303
D) 2,021
E) 2,000

The only prime numbers in the given interval are 43 and 47. Their product is:

43 x 47 = 2,021

We actually don’t have to multiply the numbers; we know the product of 43 and 47 has a units digit of 1, and the only answer choice with a units digit of 1 is D (50! and 40! both have their units digit equal to 0 and thus, the units digit of 50! - 40! is also 0).

Answer: D
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