(1) There exists a positive integer m such that k = jm + 5.
(2) j > 5
The reason is as follows:
k/j = (jm + 5)/j = m + 5/j
If 5 < j, then the remainder will be 5.
But when 5 > j, the remainder can't be 5.
The examples of gokul showed this (Thank you, gokul :D)
So, (1) is insuff.
(1) and (2) is suff.
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