In a simultaneous throw of two dice, what is the probability of getting a total of 7?
1/6
1/4
2/3
3/4
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1
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If ,, are probabilities of three mutually exclusive events, then
SolutionAnswer :1/2 |
2
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The students in a class are seated, according to their marks in the previous examination. Once, it so happens that four of the students got equal marks and therefore the same rank. To decide their seating arrangement, the teacher wants to write down all possible arrangements one in each of separate bits of paper in order to choose one of these by lots. How many bits of paper are required?
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3
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In how many ways can 10 people line up at a ticket window of a railway station?
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4
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If P(A)=2/5, P(B)=3/10 and P(A ∩ B) =51, then P(A' | B'). P(B' | A') is equal to
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5
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In a group of 6 boys and 4 girls, four children are to be selected. In how many different ways can they be selected such that at least one boy should be there?
Solution |
6
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How many four-digit numbers, each divisible by 4 can be formed using the digits 5, 6, 7, 8, 9, repetition of digits being allowed in any number?
Solution |
7
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Find the probability that a leap year selected at random will contain 53 Sundays
Solution |
8
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A five-letter word is to be formed from a group of 5 vowels and 4 consonants, using at least one vowel and at least one consonant. In how many ways the word having a greater number of consonants than vowels can be formed?
Solution |
9
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Ten participants are participating in a competition. In how many ways can the first three prizes be won?
Solution |
10
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A, B, C, D and E sit on five chairs all of which are facing north. C will sit only on the leftmost chair and B will not sit anywhere to the left of A. In how many ways they can be seated?
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