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If the events S and T have equal probabilities and are independent with P(S ∩ T) = p > 0, then P(S) is
Question

If the events S and T have equal probabilities and are independent with P(S ∩ T) = p > 0, then P(S) is

A.

√p

B.


C.

p

D.

None of these

Correct option is A

Given:
P(S ∩ T) = p
P(S) = P(T)
Formula Used:
For independent events,
P(S ∩ T) = P(S)P(T)
Solution:
Let P(S) = P(T) = x.
Since S and T are independent,
P(S ∩ T) = P(S)P(T)
=> p = x × x
=> x² = p
Since probability is non-negative,
=> x = √p
Therefore,
P(S) = √p.
The correct answer is (a) √p.

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