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805+ (Hard)|   Remainders|      
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kevincan
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GRE 1: Q170 V170
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GRE 1: Q170 V170
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For all positive integers, f(x) is defined as the sum of the 28 Mar 2026, 01:36
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

95% (hard)

Question Stats:

14% (02:37) correct 86% (02:32) wrong based on 14 sessions

History

Date
Time
Result
Not Attempted Yet
For all positive integers, f(x) is defined as the sum of the remainders when x is divided by 8 and by 9. For how many positive integers less than 720 is f(x) = 1?

A) 10
B) 18
C) 20
D) 36
E) 72
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Official Answer
C
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