Answer :

Since a pair of dice is thrown, all the possible outcomes or sample space (S) will be as follows

A: the sum is greater than 8

Possible sum greater than 8 are 9, 10, 11 & 12

∴ A=

B: 2 occurs on either die

Here possibilities are there that the number 2 will come on first die or second die or both the die simultaneously

B=

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

So the sum can be only 9 or 12

C=

__For 2 elements to be mutually exclusive, then there should not be any common element amongst them__

(i) A∩ B =ϕ

As there is no common element in A and B

So A& B are mutually exclusive

(ii) B ∩ C = ϕ

Since there is no common element between

So B and C are mutually exclusive.

(iii) A ∩ C

⇒ ≠ ϕ

Since A and C has common elements,

∴ A and C are mutually exclusive.

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