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A certain company will issue 4-letter identification codes to all of

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Joined: 02 Sep 2009
Posts: 51229
A certain company will issue 4-letter identification codes to all of  [#permalink]

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New post 26 Jun 2018, 04:41
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

67% (01:06) correct 33% (01:17) wrong based on 59 sessions

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A certain company will issue 4-letter identification codes to all of its employees. The codes will include only the letters A, C, F, H, K, Q and V. If all the letters of each code are distinct, how many such codes are possible?

A. 35

B. 70

C. 105

D. 840

E. 1680

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Re: A certain company will issue 4-letter identification codes to all of  [#permalink]

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New post 26 Jun 2018, 04:55

Solution



Given:
    • A certain company will issue 4-letter identification codes to all of its employees
    • The codes will include only the letters A, C, F, H, K, Q and V
    • All the letters of each code are distinct

To find:
    • The number of possible codes

Approach and Working:
We can assume the 4-letter code as following: (1) (2) (3) (4)

    • Possibilities for place (1) = 7
    • Possibilities for place (2) = 6
    • Possibilities for place (3) = 5
    • Possibilities for place (4) = 4
Therefore, total number of possibilities = 7 * 6 * 5 * 4 = 840

Hence, the correct answer is option D.

Answer: D
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Re: A certain company will issue 4-letter identification codes to all of &nbs [#permalink] 26 Jun 2018, 04:55
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