This is my sample midterm question, but my professor doesn't provide answer for this one. Can you help me out?

"Show that the number of partitions of n into ` parts of size at most k is the same as the number of of partitions of k`?n into at most ` parts of size at most k?1."

Show that the number of partitions of 11 into i parts of size at most A: is the same as the number of of partitions of k3 n into at most 3 parts of size at most 1:: 1