1.
450y =n ^3
=>3^2 * 5^2 * 2 * y = n^3
y=3*5*2^2
ans A.
2. y can be zero .
x ^4 = 100, nearest is 3^4..so x had be a li'l greater than 3 but definitel less than 6.
x has to lie between 3 and 6.
hence answer is B
Probability for Red ball = 3C1/9C1= 1/3
Probability for White ball = 2C1/9C1= 2/9
for Red followed by white = 2/27 ...i
for White followed by red = 2/27 ....ii
Total = i +ii = 4/24