Get the Recurrence of Days Randomally
I faced a problem where I had to generate random picks in a week so that it can include permutations of all days in a week, in every possible manner. Computationally it creates following possibilities, plus one more fora none condition P = 7C1 + 7C2 + 7C3 + 7c4 + 7C5 + 7C6 + 7C7 = 7 + 21 + 35 + 35 + 21 + 7 + 1 = 127 So 128 conditions including 1 none of all condition. Where nCk is computed as n!/((n-k)!*k!) or (n (n-1) (n-2) .... (n-k+1))/ (k (k-1) (k-2)........1) So going by traditional programming it will take 128 if else conditions or switch cases to generate a random sample. This will grow exponentially if the value of 'n' increases in case the requirement changes to some thing. The following method returns a string of a possible random sample out of these 128 probabilities. Here days are marked as follows. Sunday as 0 Monday as 1 Tuesday as 2 Wednesday as 3 Thursday as 4 Friday as 5 Saturday as 6 The output would come as a rando