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Byju's Answer
Standard XII
Mathematics
Combination
Number of non...
Question
Number of non negative integral solutions of
x
1
+
x
2
+
x
3
+
x
4
=
20
.
A
23
C
3
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B
24
C
4
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C
23
C
4
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D
None of these
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Solution
The correct option is
A
23
C
3
No.of non-negative integral solutions
x
1
+
.
.
+
x
r
=
n
is
n
+
1
−
1
C
r
−
1
=
20
+
4
−
1
C
4
−
1
=
23
C
3
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0
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