NDA Government Jobs Exams

If A and B are any two events such that P(A) = 0.4, P(B) = 0.3, P(A ∪ B) = 0.9, then what is the value of
P(A ∪ B) equal to ?

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NDA Other Question

A bag contains 6 black and 4 white balls. Two balls are drawn at random one after the other without
replacement. What is the probability that both are black A fair coin is tossed repeatedly. The probability of getting a result in the fifth toss different from those
obtained in the first four tosses is