MCQ
In the expansion of $\Big(\sqrt{2}+\sqrt[5]{3}\Big)^{120}$ the number of irrational terms is:
  • A
    12
  • B
    13
  • 108
  • D
    54

Answer

Correct option: C.
108
Total number of rational terms is
$\frac{120}{\text{L}.\text{C}.\text{M}(5,2)}+1$
$\frac{120}{10}+1$
$=13$
Hence total number of irrational terms are
= 121 - 13
= 108

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