turkey-yks 2011 Q17

turkey-yks · Other · ygs Number Theory Congruence Reasoning and Parity Arguments

If a number of the form $7k + 4$ is divisible by 3 without remainder, how many positive integers k less than 21 are there?
A) 8 B) 9 C) 7 D) 6 E) 5

If a number of the form $7k + 4$ is divisible by 3 without remainder, how many positive integers k less than 21 are there?

A) 8
B) 9
C) 7
D) 6
E) 5