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Problem
Problem
If
2
n
C
3
:
n
C
2
=
44
:
3
{}^2nC_3 : {}^nC_2 = 44 : 3
2
n
C
3
:
n
C
2
=
44
:
3
, for which of the following value of
r
r
r
, the value of
n
C
r
{}^nC_r
n
C
r
will be 15. a.
r
=
3
r = 3
r
=
3
b.
r
=
4
r = 4
r
=
4
c.
r
=
5
r = 5
r
=
5
d.
r
=
6
r = 6
r
=
6
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