Three coins are tossed. Describe three events which are mutuall

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 Multiple Choice QuestionsShort Answer Type

401. Three coins are tossed. Describe three events which are mutually exclusive and exhaustive.
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402. Three coins are tossed. Describe two events which are not mutually exclusive. 
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403. Three coins are tossed. Describe two events which are mutually exclusive but not exhaustive.
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404. Three coins are tossed. Describe three events which are mutually exclusive but not exhaustive.


Three coins are tossed.
rightwards double arrow The sample space is: S = {HHH, HHT, HTH, THH, HTT, THT, TTH, TTT}
         Event E = three heads show
rightwards double arrow              E = {HHH}
         Event F = exactly two heads show
rightwards double arrow              F = {HHT, HTH, THH}
          Event G = three tails show
rightwards double arrow               G = {TTT}
Now,       straight E intersection straight G equals left curly bracket HHH right curly bracket space intersection space left curly bracket HHT comma space THH comma space HTH right curly bracket space equals space straight ϕ
              straight F intersection straight G space equals space left curly bracket HHT comma space HTH comma space THH right curly bracket space intersection space left curly bracket TTT right curly bracket space equals space straight ϕ
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rightwards double arrow E, F and G are mutually exclusive events.
But,  straight E union straight F union straight G space equals space left curly bracket HHH right curly bracket space union space left curly bracket HHT comma space HTH comma space THH right curly bracket space union space left curly bracket TTT right curly bracket
                       equals left curly bracket HHH comma space HHT comma space HTH comma space THH comma space TTT right curly bracket space not equal to space straight S
rightwards double arrow  E, F and G are not exhaustive.
Hence, events E, F and G are mutually exclusive, but not exhaustive.

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 Multiple Choice QuestionsLong Answer Type

405.

An experiment involves rolling a pair of dice and recording the numbers that come up. Describe the following events:

A : The sum is greater than 8.

B : 2 occurs on either die.

C : The sum is at least 7 and a multiple of 3.

Which pairs of these events are mutually exclusive? 

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406.

Two dice are thrown. The events A, B, C are as follows:

A = Getting an odd number on the first die.

B = Getting a total of 7 on the two dice.

C = Getting a sum ≥ 8 on the two dice.

Describe events:

(i) A' (ii) not B (iii) A or B (iv) B and C (v) A but not C (vi) B but not C (vii) B or C

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 Multiple Choice QuestionsShort Answer Type

407.

Two dice are thrown. The events A, B and C are as follows:

A: getting an even number on the first die.

B: getting an odd number on the first die.

C: getting the sum of the numbers on the dice ≤ 5

State whether the following is true or false (give reason for your answer):

 A and B are mutually exclusive.

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408.

Two dice are thrown. The events A, B and C are as follows:

A: getting an even number on the first die.

B: getting an odd number on the first die.

C: getting the sum of the numbers on the dice ≤ 5

State whether the following is true or false (give reason for your answer):

A and B arc mutually exclusive and exhaustive.

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409.

Two dice are thrown. The events A, B and C are as follows:

A: getting an even number on the first die.

B: getting an odd number on the first die.

C: getting the sum of the numbers on the dice ≤ 5

State whether the following is true or false (give reason for your answer):
A = B'

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410.

Two dice are thrown. The events A, B and C are as follows:

A: getting an even number on the first die.

B: getting an odd number on the first die.

C: getting the sum of the numbers on the dice ≤ 5

State whether the following is true or false (give reason for your answer):
A and C are mutually exclusive.

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