Find the number of solutions of \( x+y+z+w=20 \) under the followin... VIDEO
Find the number of solutions of \( x+y+z+w=20 \) under the following conditions:
\[
x, y, z, w \in\{1,2,3 \text {, }
\]
\( 10\} \)
\( \mathrm{P} \)
W
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