50 25 marbles are placed at equal distances on a line 130 cm long, the distances from the ends also being the same. There is no marble at any end of the line. Find the distance between two consecutive marbles.

Q. There are $20$ marbles in a bag and $10$ of them are blue. What is the probability that any $1$ marble drawn at random will not be blue?

Q. A bag contains 8 marbles of which 3 are blue and 5 are red. One marble is drawn at random, its colour is noted and the marble is replaced in the bag. A marble is again drawn from the bag and its colour is noted. Find the probability that the marble will be
(i) blue followed by red.
(ii) blue and red in any order.
(iii) of the same colour.

Q. There are $7$ red and $9$ purple marbles in a bag of marbles. Scarlett picks one marble at random from the bag. What is the possibility that she did not pick a purple marble?

Q. Each of the marbles in a jar is either red or white or blue. If one marble is to be selected at random from the jar, what is the probability that the marble will be blue?
(1) There are a total of 24 marbles in the jar, 8 of which are red.
(2) The probability that the marble selected will be white isl

Q. A jar contains 2 green marbles, 4 blue marbles, 3 yellow marbles and 2 black marbles. A marble is chosen at random from the jar and replaced. Then a second marble is chosen at random. What is the probability of the first marble being green and the second marble being yellow?