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# Set A has 3 elements and set B has 4 elements. The number of

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Manager
Joined: 22 Sep 2010
Posts: 89

Kudos [?]: 221 [0], given: 0

Set A has 3 elements and set B has 4 elements. The number of [#permalink]

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30 Sep 2010, 05:11
00:00

Difficulty:

55% (hard)

Question Stats:

23% (00:24) correct 77% (00:29) wrong based on 44 sessions

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Set A has 3 elements and set B has 4 elements. The number of injections that can be defined from A to B is

A. 144
B. 12
C. 24
D. 64
E. 124
[Reveal] Spoiler: OA

Kudos [?]: 221 [0], given: 0

Math Expert
Joined: 02 Sep 2009
Posts: 42305

Kudos [?]: 133076 [0], given: 12403

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30 Sep 2010, 05:45
pzazz12 wrote:
Set A has 3 elements and set B has 4 elements. The number of injections that can be defined from A to B is

A. 144
B. 12
C. 24
D. 64
E. 124

But if interested as 3<4 then the number of injections from A to B is $$P^3_4=24$$. But again don't waste your time on this problem.
_________________

Kudos [?]: 133076 [0], given: 12403

Manager
Joined: 22 Sep 2010
Posts: 89

Kudos [?]: 221 [0], given: 0

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01 Oct 2010, 05:03
Bunuel wrote:
pzazz12 wrote:
Set A has 3 elements and set B has 4 elements. The number of injections that can be defined from A to B is

A. 144
B. 12
C. 24
D. 64
E. 124

But if interested as 3<4 then the number of injections from A to B is $$P^3_4=24$$. But again don't waste your time on this problem.

thank you,but can you explain me little bit clear...........

Kudos [?]: 221 [0], given: 0

Math Expert
Joined: 02 Sep 2009
Posts: 42305

Kudos [?]: 133076 [0], given: 12403

### Show Tags

01 Oct 2010, 05:36
pzazz12 wrote:
Bunuel wrote:
pzazz12 wrote:
Set A has 3 elements and set B has 4 elements. The number of injections that can be defined from A to B is

A. 144
B. 12
C. 24
D. 64
E. 124

But if interested as 3<4 then the number of injections from A to B is $$P^3_4=24$$. But again don't waste your time on this problem.

thank you,but can you explain me little bit clear...........

_________________

Kudos [?]: 133076 [0], given: 12403

Re: Functions........   [#permalink] 01 Oct 2010, 05:36
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