Bag A contains4 white, 3black balls.Bag B contains 3 white and 5 black balls.One ball is drawn from each bag .The probability that both are black is

The radius of the sphere x²+y²+z²-2x+4y-6z+7=0 is

The distance of (1, -2) from the common chord of x²+y²-5x+4y-2=0 and x²+y²-2x+8y+3=0 is

If the probability for A to fail in one exam is 0.2 and that of B is 0.3, then the probability that either A or B fails is

If 5 biscuits are distributed among 6 children, the probability that a particular child gets 4 sweets is

Three students A,B,C are to take part in a swimming competition. The probabilities of A ‘s winning or the probability of B’s winning of B’s winning is 3 times the probability of C’s winning. The probability of the event of either B or C to win is

If the tangents to the parabola y²=4ax at (x₁,y₁) and (x₂,y₂) meet on the axis then

The distance of the point (1,2) from the common chord of the circles x²+y²-2x-6y-6=0 and x²+y²+6x-16=0 is

If a,b, c are the probabilities of getting the sums 6,7,10 when 2 dice are thrown  when the descending order of a,b,c is

A, B,C are aiming to shot a balloon. A will succeed 4 times out of 5 attempts. The chance of B to shoot the balloon is 3out of 4 and that of C is 2out of 3. If the three aim the balloon simultaneously, then the probability that at least two of them hit the balloon is