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We define that K@J is the product of j number from k in incr

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by Max@Math Revolution » Wed Feb 10, 2016 8:58 pm
We define that K@J is the product of j number from k in increasing order for positive integers K, J. For example, 6@4=6*7*8*9. If A=2020 and B=2120, what is the value of the ratio A/B?

A. 1/2
B. 1/3
C. 2/3
D. 1/4
E. 1/5


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by Max@Math Revolution » Sat Feb 13, 2016 9:41 pm
We define that K@J is the product of j number from k in increasing order for positive integers K, J. For example, 6@4=6*7*8*9. If A=2020 and B=2120, what is the value of the ratio A/B?

A. 1/2
B. 1/3
C. 2/3
D. 1/4
E. 1/5


--> A/B=20*21*......*39/21*22*....*39*40=20/40=1/2
Therefore, the answer is A.
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