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Problem
Problem
The total number of positive integral solutions of
15
<
x
1
+
x
2
+
x
3
≤
20
15 < x_1 + x_2 + x_3 \le 20
15
<
x
1
+
x
2
+
x
3
≤
20
is equal to a. 695 b. 765 c. 1125 d. None of these
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