3
7
9
12
Correct answer is C
Total no of balls = 30
Let x = no. of red balls
Pr(red) = \(\frac{x}{30}\)
Pr(black) = \(\frac{3}{10} = \frac{9}{30}\)
Pr(white) = \(\frac{2}{5} = \frac{12}{30}\)
No. of black balls = 9
No. of white balls = 12
9 = 12 + x = 30
x = 30 - 21
x = 9
No. of red balls = 9
Evaluate \(\int_{0} ^{\frac{\pi}{2}} \sin x \mathrm d x\)...
Show that \(\frac{\sin 2x}{1 + \cos x}\) + \(\frac{sin2 x}{1 - cos x}\) is...
Express 0.000834 in standard form ...
An (n - 2)2 sided figure has n diagonals. Find the number n diagonals for 25-sided figure...
Make s the subject of the relation: P = S + \(\frac{sm^2}{nr}\)...