if a letter is chosen at random from the 'SECONDARY' what is the probability that it is a consonant

if a letter is chosen at random from the 'SECONDARY' what is the probability that it is a vowel.

cards marked with numbers 1, 2,3,.....,25 are placed in a box and mixed thoroughly and card is drawn at random from the box what is the probability that the card is an odd number neither divisible by 5 or by 10

A letter of English alphabet is chosen at random. Determine the probability that the chosen letter is a consonant.

A box contains 12 balIs out of which x are black.If one ball is drawn at random from the box,what is the probability that it will be a black ball? If 6 more black balls are put the box,the probability of drawing a black ball is now double of what it was before. find x.

A bag contains 3 red balls and 5 black balls. A ball is drawn at random from the bag. What is the probability that the ball drawn is(ii) not red?

A lot of 20 bulbs contain 4 defective ones. One bulbs is drawn at random from the lot.Suppose the bulb drawn in (i) is not defective and is not replaced. Now one bulb is drawn at random from the rest. What is the probability that this bulb is not defective?

A bag contains 5 white balls, 7 red balls, 4 black balls and 2 blue balls. One ball is drawn at random from the bag. What is the probability that the ball drawn is: not white

A bag contains 5 white balls, 7 red balls, 4 black balls and 2 blue balls. One ball is drawn at random from the bag. What is the probability that the ball drawn is: neither white nor black.

cards marked with numbers 1, 2,3,.....,25 are placed in a box and mixed thoroughly and card is drawn at random from the box what is the probability that the number of the card is a prime number