Published by:
CGP EDU Academic Team
Published on: August 12, 2026
In the expansion of 
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Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(a, b, c, d)
T r + 1 = 20 C r 
6 – r/4
= 20 C r 
2 –r/4 3 –r/4
= 20 C r . 
for rational terms 
and 
must be integer and r should lie in [0, 20]
= integer ⇒ r = 0, 4, 8, 12, 16, 20
r = 8 and 20 ; 
is also integer only two terms are rational so 21 – 2 = 19 terms are irrational. For middle term r = 10
So middle term is also irrational.
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