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<code>
randomCombination(arrayOfElements, n, k)
'''for ''' i = 1 '''to ''' n '''if ''' i <= k
a[i] = 1;
'''else'''
a[i] = 0;
random_shuffle(a);
'''for ''' i = 1 '''to ''' n '''if ''' a[i] == 1
ans.push(arrayOfElement[i]);
'''return ''' ans;
</code>
