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Solution


Q.

Probability of happening of an event is denoted by p and probability of non-happening of the event is denoted by q. Relation between p and q is
1 p + q = 1  
2 p = 1,q = 1
 
3 p = q - 1  
4 p + q + 1 = 0  

Ans.

(1)

P(happening of the event) + P(not happening of the event) = 1

Sum of probability of happening and non-happening of an event is always 1. So, p + q = 1