If XXX is a continuous random variable with PDF f(x)=2xf(x) = 2xf(x)=2x for x∈[0,1]x \in [0, 1]x∈[0,1], what is E[X2]E[X^2]E[X2]?
1/21/21/2
1/31/31/3
2/32/32/3
1/41/41/4