7.Binomial Theorem
hard

$\left( {{7^{1/5}} - {3^{1/10}}} \right)^{60}$  ના વિસ્તરણમાં કુલ અસંમેય પદોની સંખ્યા મેળવો.

A

$55$

B

$49$

C

$48$

D

$54$

(JEE MAIN-2019)

Solution

General term $\mathrm{T}_{\mathrm{r}+1}=^{60} \mathrm{C}_{\mathrm{r}}, 7^{\frac{\mathrm{e}-\mathrm{r}}{5}} 3^{\frac{\mathrm{r}}{10}}$

for rational term, $\mathrm{r}=0,10,20,30,40,50,60$

$\Rightarrow$ number of rational terms $=7$ 

$\therefore $ number of irrational terms $=54$

Standard 11
Mathematics

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