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  4. Sherlock and Permutations
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Sherlock and Permutations

  • vishu006 + 0 comments

    Hey take a look at this if it helps

    from math import factorial

n=int(raw_input())
for i in range(n):
    a,b=map(int,raw_input().split())
    print (factorial(a+b-1)/(factorial(a)*factorial(b-1)))%1000000007