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# A three-digit code for certain logs uses the digits 0, 1, 2,

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Director
Joined: 06 Jan 2008
Posts: 547
Followers: 2

Kudos [?]: 393 [0], given: 2

A three-digit code for certain logs uses the digits 0, 1, 2, [#permalink]

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28 Apr 2008, 13:26
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A three-digit code for certain logs uses the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 according to the
following constraints. The first digit cannot be 0 or 1, the second digit must be 0 or 1, and the
second and third digits cannot both be 0 in the same code. How many different codes are
possible?
A. 144
B. 152
C. 160
D. 168
E. 176
Senior Manager
Joined: 19 Apr 2008
Posts: 318
Followers: 3

Kudos [?]: 84 [0], given: 0

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28 Apr 2008, 14:30
saravalli wrote:
A three-digit code for certain logs uses the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 according to the
following constraints. The first digit cannot be 0 or 1, the second digit must be 0 or 1, and the
second and third digits cannot both be 0 in the same code. How many different codes are
possible?
A. 144
B. 152
C. 160
D. 168
E. 176

8*1*9 +8*1*10
Director
Joined: 06 Jan 2008
Posts: 547
Followers: 2

Kudos [?]: 393 [0], given: 2

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28 Apr 2008, 17:14
oops i over looked the third condition and got 160.
agree B.
OA B. Thanks
Re: DS - code   [#permalink] 28 Apr 2008, 17:14
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