If each of 3 digit code form integers from 1 to 20, inclusiv

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Max@Math Revolution: Elite Legendary Member; Posts: 3991; Joined: Fri Jul 24, 2015 2:28 am; Location: Las Vegas, USA; Thanked: 19 times; Followed by:37 members

If each of 3 digit code form integers from 1 to 20, inclusiv

by Max@Math Revolution » Thu Jan 28, 2016 5:52 pm

If each of 3 digit code form integers from 1 to 20, inclusively, and each of the digits are different, how many possible codes are there?

A. 6,040
B. 6,840
C. 6,240
D. 6,340
E. 8,440

* A solution will be posted in two days.

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talaangoshtari: Master | Next Rank: 500 Posts; Posts: 154; Joined: Wed May 21, 2014 4:29 am; Thanked: 8 times; Followed by:1 members

by talaangoshtari » Thu Jan 28, 2016 8:09 pm

20*19*18 = 6840 => B is the correct answer

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Max@Math Revolution: 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 » Sun Jan 31, 2016 6:28 pm

If each of 3 digit code is formed of integers from 1 to 20, inclusively, and each of the digits are different, how many possible codes are there?

A. 6,040
B. 6,840
C. 6,240
D. 6,340
E. 8,440

* A solution will be posted in two days.

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Brent@GMATPrepNow: GMAT Instructor; Posts: 16207; Joined: Mon Dec 08, 2008 6:26 pm; Location: Vancouver, BC; Thanked: 5254 times; Followed by:1268 members; GMAT Score:770

by Brent@GMATPrepNow » Sun Jan 31, 2016 11:00 pm

Max@Math Revolution wrote:If each of 3 digit code form integers from 1 to 20, inclusively, and each of the digits are different, how many possible codes are there?

A. 6,040
B. 6,840
C. 6,240
D. 6,340
E. 8,440

* A solution will be posted in two days.

Are you sure you mean "digit"?

Cheers,
Brent

Brent Hanneson - Creator of GMATPrepNow.com

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