For this you can use pascal triangle . It will give the permutation
value of the the series .
1
1 2 1
1 3 3 1
1 4 6 4 1
1 5 10 10 5 1
1 6 15 20 15 1
This can easily prepreocessed using dynamic method way .
a[0][i]=1 1<=i<=n
a[i][0]=1 1<=i<=n
a[i][j] = a[i-1][j-1]+a[i][j-1]
try this out ....!!!!
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