Difference between revisions of "1990 AHSME Problems/Problem 11"
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| − | How many positive integers less than 50 have an odd number of positive integer divisors? | + | == Problem == |
| + | |||
| + | How many positive integers less than <math>50</math> have an odd number of positive integer divisors? | ||
| + | |||
| + | <math>\text{(A) } 3\quad | ||
| + | \text{(B) } 5\quad | ||
| + | \text{(C) } 7\quad | ||
| + | \text{(D) } 9\quad | ||
| + | \text{(E) } 11</math> | ||
| + | |||
| + | == Solution == | ||
| + | <math>\fbox{C}</math> | ||
| + | |||
| + | == See also == | ||
| + | {{AHSME box|year=1990|num-b=10|num-a=12}} | ||
| + | |||
| + | [[Category: Introductory Number Theory Problems]] | ||
{{MAA Notice}} | {{MAA Notice}} | ||
Revision as of 17:36, 28 September 2014
Problem
How many positive integers less than 
have an odd number of positive integer divisors?
Solution
See also
| 1990 AHSME (Problems • Answer Key • Resources) | ||
| Preceded by Problem 10 |
Followed by Problem 12 | |
| 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 • 26 • 27 • 28 • 29 • 30 | ||
| All AHSME Problems and Solutions | ||
The problems on this page are copyrighted by the Mathematical Association of America's American Mathematics Competitions. 
