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

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Intern
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A three-digit code for certain logs uses the digits 0, 1, 2, [#permalink] New post 14 Nov 2008, 20:52
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
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Re: digit code--26 [#permalink] New post 14 Nov 2008, 21:38
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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Re: digit code--26 [#permalink] New post 15 Nov 2008, 09:59
Got 152 as well.

72 (for second digit 0 ) + 80 (for second digit 1)
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Re: digit code--26 [#permalink] New post 15 Nov 2008, 10:50
i also got 152 strangely my attempt from last night is not posted on the forum. Mebbe I was too sleepy :roll:
Re: digit code--26   [#permalink] 15 Nov 2008, 10:50
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