CBSE Class 11 Probability Worksheet A

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1. Three coins are tossed simultaneously list the sample space for the event. 

2. Two dice are thrown simultaneously. Find the prob. of getting doublet. 

3. 20 cards are numbered from 1 to 20. One card is then drawn at random. What is the prob. of a prime no.

4. If 3/ 10 is the prob. that an event will happen, what is the prob. that it will not happen?

5. If A and B are two mutually exclusive events such that P (A) 1/2  = and P (B) 1/3= find P (A or B)

6. A coin is tossed three times consider the following event A : No head appears, B : Exactly one head appears and C : At least two heads appears do they form a set of mutually exclusive and exhaustive events.

7. A and B are events such that P (A) = 0.42, P (B) = 0.48, and P (A and B) = 0.16 determine (i) P (not A) (ii) P (not B) (iii) P (A or B)

8. Find the prob. that when a hand of 7 cards is drawn from a well shuffled deck of 52 cards, it contains (i) all king (ii) 3 kings (iii) at least 3 kings

9. Three letters are dictated to three persons and an envelope is addressed to each of them, those letters are inserted into the envelopes at random so that each envelope contains exactly one letter. Find the prob. that at least one letter is in its proper envelope.

10. If 4 digit no. greater than 5,000 are randomly formed the digits 0,1,3,5 and 7 what is the prob. of forming a no. divisible by 5 when 

(i). The digits are repeated (ii) The repetition of digits is not allowed.

Click on link below to download CBSE Class 11 Probability Worksheet A.