91Ó°ÊÓ

An urn contains 7 red and 4 blue balls. Two balls are drawn at random with replacement. Find the probability of getting: [CBSE-2007] (i) 2 red balls. (ii) 2 blue balls. (iii) 1 red and 1 blue ball.

Two dice are thrown simultaneously. Find the probability of getting: (i) an even number as the sum. [CBSE-95] (ii) the sum as a prime number. [CBSE-95]

From 80 cards numbered 1 to 80,2 cards are selected randomly. The probability that both the cards have the numbers divisible by 4 is given by: (a) \(21 / 316\) (b) \(19 / 316\) (c) \(1 / 4\) (d) None of these

Four coins are tossed simultaneously. Find the chance to get at least one head. [MP-1993]

Fifteen persons among whom are \(A\) and \(B\) sit down at random at a round table. The probability that there are 4 persons between \(A\) and \(B\) is (a) \(1 / 3\) (b) \(2 / 3\) (c) \(2 / 7\) (d) \(1 / 7\)

Three coins are tossed simultaneously. List the sample space of the random experiment. [CBSE-91]

Find the probability that the two digit number formed by digits \(1,2,3,4,5\) is divisible by 4 (while repetition of digit is allowed): (a) \(1 / 30\) (b) \(1 / 20\) (c) \(1 / 40\) (d) \(1 / 5\)

\(A\) and \(B\) are two events such that \(P(A)=\) \(0.42, P(B)=0.48\) and \(P(A B)=0.16\), find \(P(A+B)\) [MP-1998]

When an ordinary dice is thrown find the probability of getting a number greater than 3 . $$ [\mathrm{MP}-93,97,2002,2004(A)] $$

Find the probability of drawing a diamond card in each of the two consecutive draws from a well-shuffled pack of cards, if the card drawn is not replaced after the first draw. [CBSE-2002(C)]