count no. of ways to partition in k subsets
Input: n = 3, k = 2
Output: 3
Explanation: Let the set be {1, 2, 3}, we can partition
it into 2 subsets in following ways
{{1,2}, {3}}, {{1}, {2,3}}, {{1,3}, {2}}
Input: n = 3, k = 1
Output: 1
Explanation: There is only one way {{1, 2, 3}}
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