exam Maths Puzzle Numerical Ability

Four balls are selected at random without replacement from an urn containing three white balls and five blue balls. Find the probability of two or three of the balls are white.

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exam Other Question

20. Write the equation of the line with x-intercept (-1, 0) and undefined slope.
A) y = -1
B) x = -1
C) y = -x
D) x = 0
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Thank you so very much!! Given set C= (3,4,5,6), which of the following is TRUE:

a. C={xlx e N and x<6}
b. C= {xlx e N and 2<x<7}
c. n(C)=5
d. All of the Above