The number of positive integer solutions for the equation x +y +z + t = 10 is	Choose the correct answer: A) 60 B) 74 C) 84 D) 54 E) 104
The number of positive integer solutions for the equatio fx1+x2+⋯+xn=k   (k-1)C(n-1)- where k is the number and n is number of variable in the equation.   10-1 84 4-1 = 9843 = 84   Answer : 84
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The number of positive integer solutions for the equation x +y +z + t = 10 is