Difference between revisions of "2012 UNCO Math Contest II Problems/Problem 1"
(Created page with "== Problem == (a) What is the largest factor of <math>180</math> that is not a multiple of <math>15</math>? (b) If <math>N</math> satisfies <math>2^5 \times 3^2 \times5^4 \time...") |
(→Solution) |
||
(3 intermediate revisions by one other user not shown) | |||
Line 8: | Line 8: | ||
== Solution == | == Solution == | ||
+ | (a) <math>36</math> (b) <math>196</math> | ||
+ | <math>(a)</math> | ||
+ | |||
+ | |||
+ | The prime factorization of <math>180</math> is | ||
+ | |||
+ | |||
+ | <math>2^2 \times 3^2 \times5</math>. | ||
+ | |||
+ | |||
+ | We need to get the largest factor of <math>180</math> which isn't a multiple of <math>15</math>, so we can't include both <math>3</math> and <math>5</math>. <math>3^2</math> is greater than <math>5</math>, so we'll use that and <math>2^2</math> to get <math>3 \times 3 \times 2 \times 2 = \fbox{\textbf 36}</math>. | ||
+ | |||
+ | |||
+ | <math>(b)</math> | ||
+ | |||
+ | |||
+ | <math>2^5 \times 3^2 \times5^4 \times 7^3 \times 11=99000 \times N</math> | ||
+ | |||
+ | |||
+ | <math>2^5 \times 3^2 \times5^4 \times 7^3 \times 11=2^3 \times 3^2 \times 5^3 \times 11 \times N</math> | ||
+ | |||
+ | |||
+ | <math>2^2 \times 5 \times 7^3= N</math> | ||
+ | |||
+ | |||
+ | The largest square factor of <math>N</math> is <math>2^2</math> <math>\times</math> <math>7^2</math> = <math>\fbox{\textbf 196}</math> | ||
== See Also == | == See Also == | ||
− | {{ | + | {{UNCO Math Contest box|n=II|year=2012|before=First Problem|num-a=2}} |
[[Category:Introductory Algebra Problems]] | [[Category:Introductory Algebra Problems]] |
Latest revision as of 20:52, 8 January 2024
Problem
(a) What is the largest factor of that is not a multiple of ?
(b) If satisfies , then what is the largest perfect square that is a factor of ?
Solution
(a) (b)
The prime factorization of is
.
We need to get the largest factor of which isn't a multiple of , so we can't include both and . is greater than , so we'll use that and to get .
The largest square factor of is =
See Also
2012 UNCO Math Contest II (Problems • Answer Key • Resources) | ||
Preceded by First Problem |
Followed by Problem 2 | |
1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 | ||
All UNCO Math Contest Problems and Solutions |