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7.Binomial Theorem
easy
જો ${\left( {{y^2} + \frac{c}{y}} \right)^5}$ ના વિસ્તરણમાં $y$ નો સહગુણક મેળવો.
A
$20c$
B
$10c$
C
$10{c^3}$
D
$20{c^2}$
Solution
(c) $2(5 -r) + (-1) r = 1 $
$\Rightarrow 10 -2r -r = 1 $
$\Rightarrow \,r = 3$
Thus coefficient of y is $^5{C_3}{c^3} = \frac{{5 \times 4}}{{2 \times 1}}{c^3} = 10{c^3}$.
Standard 11
Mathematics