The probability for the given case is 1/3.
Probability is the branch of Mathematics that deals with the measurement of the chance of occurrence of a random event.
The probability of any event always lie in the close interval of 0 and 1 [0,1].
A spinner has numbers indicated on it from one to six.
Suppose A be the event spinner lands on 1.
And, B be the event the spinner land on 4.
Now, the probability of any event is the ratio of number of favorable outcome to the total number of outcomes which is given as,
P(A) = 1/6
And, P(B) = 1/6
Thus, the probability of event A or B is given as,
P(A or B) = P(A) + P(B)
= 1/6 + 1/6
= 1/3
Hence, the probability that the spinner lands on 1 or 4 is 1/3.
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