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KEAM 2023 Math Solved Paper
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© examsnet.com
Question : 21
Total: 120
If the coefficients of
(
5
r
+
4
)
t
h
term and
(
r
−
1
)
t
h
term in the expansion of
(
1
+
x
)
25
are equal, then
r
is
6
3
5
2
4
Validate
Solution:
25
C
5
r
+
3
=
25
C
r
−
2
⇒
5
r
+
3
+
r
−
2
=
25
6
r
=
24
r
=
4
© examsnet.com
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