A. 3/14
B. 15/56
C. 29/56
D. 4/5
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
A bag A contains 2 white and 3 red balls and a bag B contains 4 white and 5 red balls. One ball is drawn at random from one of the bags and is found to be red. The probability that it was drawn from bag B is