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Andhra Pradesh State Cooperative Bank Assistant
IMPORTANT
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How many words beginning with vowels can be formed with the letters of the word EQUATION?

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Important Questions on Permutation & Combination and Probability

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Andhra Pradesh State Cooperative Bank Assistant
IMPORTANT
If three vertices of a regular hexagon are chosen at random, then the chance that they form an equilateral triangle is:
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Andhra Pradesh State Cooperative Bank Assistant
IMPORTANT
If the letters of the word DIRECTOR are arranged in such a way that all the vowels come together. Find out the total number of ways for making such an arrangement.
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Andhra Pradesh State Cooperative Bank Assistant
IMPORTANT
Three squares of a chessboard are chosen at random, the probability that two of them are of one colour and one of another is _____.
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Andhra Pradesh State Cooperative Bank Assistant
IMPORTANT
An old person forgets the last two digits of a telephone number, remembering only that these are different and dialled at random. The probability that the number is dialled correctly is
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Andhra Pradesh State Cooperative Bank Assistant
IMPORTANT
Each of A and B tosses two coins. What is the probability that they get an equal number of heads? 
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Andhra Pradesh State Cooperative Bank Assistant
IMPORTANT
A speaks truth in 75% of the cases and B in 80% of the cases. In what percentage of cases are they likely to contradict each other in stating the same fact?
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Andhra Pradesh State Cooperative Bank Assistant
IMPORTANT
From eighty cards numbered 1 to 80, two cards are selected randomly. The probability that both the cards have the numbers divisible by 4 is given by:
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Andhra Pradesh State Cooperative Bank Assistant
IMPORTANT
If A and B are two events such that P(A)= 0.5, P(B) = 0.6 and P(A  B) = 0.8. Find PAB?