12 defective pens are accidentally mixed with 132 good ones.It is not possible to just look at a pen and tell whether or not it is defective. One pen is taken out at random from this lot. Determine the probability that the pen taken out is a good one.

A lot of 20 bulbs contain 4 defective ones. One bulbs is drawn at random from the lot. What is the probability that this bulb is defective?

is it possible to open a pen cap with one finger? Why?

A box contains 5 red marbles, 8 white marbles and 4 green marbles.One marble is taken out of the box at random. What is the probability that the marble taken out will be(i) red

A box contains 5 red marbles, 8 white marbles and 4 green marbles.One marble is taken out of the box at random. What is the probability that the marble taken out will be(ii)white?

A box contains 5 red marbles, 8 white marbles and 4 green marbles.One marble is taken out of the box at random. What is the probability that the marble taken out will be (iii) not green?

a bag contains ticket number 11,12,....,30. it is taken out from the bag at random find the probability that the number on the drawn ticket it is is multiple of 7

A lot consists of 144 ball pens of which 20 are are defective and the other are good. Nila will buy a pen if it is good, but will not by if it is defective. The shopkeepers draws one pen at random and given to her. What is the probability that She will buy it.

A lot consists of 144 ball pens of which 20 are defective and the other are good. Nila will buy a pen if it is good, but will not buy if it is defective. The shopkeepers draws one pen at random and given to her. What is the probability that She will not buy it.

a lot consist of 100 ball pens of which 16 are defective and others are good Subhana will buy a pen if it is good but will not buy if it is defective the shopkeeper draw one pen at random and given to her what is the probability that she will not buy it.

A lot consists of 144 ball pens of which 20 are defective and the others are good. Nuri will buy a pen if it is good but will not buy if it is defective. The shopkeeper draws one pen at random and gives it to her. What is the prpbability that(ii) She will not buy it?