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Problem
Problem
The number of positive integral solutions of
2
x
1
+
3
x
2
+
4
x
3
+
5
x
4
=
25
2x_1 + 3x_2 + 4x_3 + 5x_4 = 25
2
x
1
+
3
x
2
+
4
x
3
+
5
x
4
=
25
, is a. 20 b. 22 c. 23 d. None of these
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