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

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Intern
Joined: 08 Nov 2008
Posts: 38
A three-digit code for certain logs uses the digits 0, 1, 2, [#permalink]

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14 Nov 2008, 21:52
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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
SVP
Joined: 29 Aug 2007
Posts: 2453

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14 Nov 2008, 22:38
gorden 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

= (8x1x10) + (8x1x9)
= 8 (10+9)
= 152
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VP
Joined: 05 Jul 2008
Posts: 1373

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15 Nov 2008, 10:59
Got 152 as well.

72 (for second digit 0 ) + 80 (for second digit 1)
Manager
Joined: 23 Jul 2008
Posts: 189

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15 Nov 2008, 11:50
i also got 152 strangely my attempt from last night is not posted on the forum. Mebbe I was too sleepy
Re: digit code--26   [#permalink] 15 Nov 2008, 11:50
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# A three-digit code for certain logs uses the digits 0, 1, 2,

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