| (i) The number of irrational terms =18 |
| (ii) The number of rational terms = 2 |
| (iii) the middle term is irrational |
| Then correct statements are- |
A) (i), (iii)
B) (ii), (iii)
C) (i), (ii)
D) All three
Correct Answer: B
Solution :
[b] \[{{T}_{r+1}}{{=}^{20}}{{C}_{r}}{{.4}^{\frac{20-r}{3}}}{{6}^{\frac{-r}{4}}};r=0\] \[\frac{20-r}{3};\frac{r}{4}\] both must be integers. \[\therefore \text{ }r=8,\,20\] \[\therefore \] 2 Rational Terms & 19 Irrational Terms Also middle term is Irrational.
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