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Questions by Laxmi Yadav

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ACE BOOK,
Number of non-negative integer solutions to the equation $x_{1}+x_{2}+x_{3}+x_{4}=12,$ if each $x_i$ must have one of the values $1,2,3,4$ is_____
Number of non-negative integer solutions to the equation $x_{1}+x_{2}+x_{3}+x_{4}=12,$if each $x_i$ must have one of the values $1,2,3,4$ is_____