Permutation and Combination/Probability








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Quiz Begins Here

Q #1
:

An unbiased die is thrown twice. Let the event A be ‘odd number on the first throw’ and B the event ‘odd number on the second throw’. Check the independence of the events A and B.

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Correct ans is A and B are independent events.

Q #2
:

In how many different ways can the letter of the word ELEPHANT be arranged so that vowels always occur together?

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Vowels = E, E and A. They can be arranged in 3!/2! Ways

So total ways = 6!*(3!/2!) = 2160


Q #3
:

There are 4 cherries, 7 pomegranates and 6 guavas in a fruit basket. In how many ways can a person make a selection of fruits from the basket?

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Zero or more Cherries can be selected in 4 + 1 = 5 ways (0 cherry, 1 cherry, 2 cherries, 3 cherries and 4 cherries)

Similarly pomegranates can be selected in 7 +1 = 8 ways

And guavas in 6 +1 = 7 ways

So total number of ways = 5*8*7 = 280

But we included a case of 0 cherry, 0 pomegranate and 0 guava, so we have to subtract this, so 280 – 1 = 279 ways


Q #4
:

There are 15 points in a plane out of which 6 are collinear. Find the number of lines that can be formed from 15 points.

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Q #5
:

Three dice are thrown simultaneously. How many times will all of them show distinct faces?

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This problem is equivalent to finding the number of 3 digit numbers with distinct digits that can be formed

using the digits 1, 2, 3, 4, 5 and 6.

Now for three digits, the places can be field in 6, 5, and 4 different ways.

4 5 6

Total number of possible dice throws when each shows a distinct face is 4 × 5 × 6 = 120.