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Byju's Answer
Standard X
Mathematics
Discriminant
15C3r = 15Cr+...
Question
15
C
3
r
=
15
C
r
+
3
, find r.
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Solution
15
C
3
r
=
15
C
r
+
3
3r + r +3 = 15
4r = 12
r=3
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