A. 10C4/ 610
B. 10C4*56/ 610
C. 10C4+56/ 610
D. 56/610
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
Three groups of children contain 3girls and one boy;2 boys; 2 girls and 2 boys. One girl and 3 boys. One child is is selected at random from each group. The probability that three selected consists of 1 girl and 2 boys is
A bag contain 12 two rupee coins, 7one rupee coins and 4 half rupee coins. If 3 coins are selectedat random, then the probability that each coin is of different value is
The probability of drawing two red balls in succession from a bag containing 3 red balls and 4 black balls when the ball that is drawn first is replaced is
The tangents at (at12, 2at1) and (at22, 2at2) on the parabola y2=4ax are at right angles then