Target Test Prep 20% Off Flash Sale is on! Code: FLASH20

Redeem
Target Test Prep
5-Day Free Trial
5-day free, full-access trial TTP

Available with Beat the GMAT members only code

MORE DETAILS
Target Test Prep
Magoosh
Magoosh
Study with Magoosh GMAT prep

Available with Beat the GMAT members only code

MORE DETAILS
Magoosh

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

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
User avatar
Elite Legendary Member
Posts: 3991
Joined: Fri Jul 24, 2015 2:28 am
Location: Las Vegas, USA
Thanked: 19 times
Followed by:37 members

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

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


* A solution will be posted in two days.
Top
User avatar
Elite Legendary Member
Posts: 3991
Joined: Fri Jul 24, 2015 2:28 am
Location: Las Vegas, USA
Thanked: 19 times
Followed by:37 members

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.
Top
Post new topic Post Reply
• Page 1 of 1