Statistics - Permutations and combinations

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1. Total number of words formed by 2 vowels and 3 consonants taken from 4 vowels and 5 consonants is equal to

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2. The number of different permutations of the word BANANA is

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3. There are four bus lines between A and B; and three bus lines between Band C.

The number of way a person round trip by bus from A to C by way of B will be

  • Option : A
  • Explanation :

    There are four ways to go from A to B and three ways to go from B to C, Hence there are 4 x 3 = 12 ways to go from A to C by way of B

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4. In how many ways can 5 red and 4 white balls be drawn from a bag containing 10 red and 8 white balls?

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5. The number of diagonals that can be drawn by joining the vertices of an octagon is

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