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JEE Advanced Model Paper 1 with solutions for online practice
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© examsnet.com
Question : 50
Total: 60
If pth term in the expansion of
(
2
1
∕
2
+
3
1
∕
3
)
11
is rational then the value of p is:
3
4
9
10
Validate
Solution:
t
r
+
1
=
11
C
r
2
11
−
r
2
.
3
r
3
Hence, r must odd and divisible by 3 ⇒ r = 3 or 9
∴ 4th and 10th term is rational ∴ ⇒ p = 4 or 10
© examsnet.com
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