Free Practice Question
PS · Problem Solving
705-805
Functions
For each positive integer k, f(k) is defined to be the number created by reversing the digits of k. For instance, f(42) = 24. How many positive two-digit integers k are there where k + f(k) is the square of a positive integer?
Answer Choices
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6
B
7
C
8
D
9
E
10
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Difficulty
705-805
Type
PS
Category