21,Paper3 , D12. How many solutions do the following equation have

x1+ x2+ x3= 11

where x1>=1, x2>=2, x3>=3

(A) C(7, 11)

(B) C(11, 3)

(C) C(14, 11)

(D) C(7, 5)

Explanation

Total number of feasible solutions are factorial(n)/(factorial(m)*factorial(n-m)).

M i s basic non zero value variable. 

C(n,m) are the feasible solutions . we know that m=3 in the problem hence C(11,3) is the answer.