Difference between revisions of "2002 AMC 12P Problems/Problem 7"

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== Problem ==
 
== Problem ==
How many three-digit numbers have at least one <math>2</math> and at least one <math>3</math>?
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How many three-digit numbers have at least one <math>2</math> and at least one <math>3?</math>
  
 
<math>
 
<math>

Revision as of 23:45, 29 December 2023

Problem

How many three-digit numbers have at least one $2$ and at least one $3?$

$\text{(A) }52 \qquad \text{(B) }54  \qquad \text{(C) }56 \qquad \text{(D) }58 \qquad \text{(E) }60$

Solution

If $\log_{b} 729 = n$, then $b^n = 729$. Since $729 = 3^6$, $b$ must be $3$ to some factor of 6. Thus, there are four (3, 9, 27, 729) possible values of $b \Longrightarrow \boxed{\mathrm{E}}$.

See also

2002 AMC 12P (ProblemsAnswer KeyResources)
Preceded by
Problem 6
Followed by
Problem 8
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
All AMC 12 Problems and Solutions

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