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Which of the following statements are co...

Which of the following statements are correct?

A

Number of 6 letter words that can be formed using letters of the word “CENTRIFUGAL” if each word must contain all the vowels is 3.7!

B

There are 15 balls of which some are white and the rest black. If the number of ways in which the balls can be arranged in row, is maximum then the number of white balls must be equal to 7 or 8. Assume balls of the same colour to be alike.

C

There are 12 things, 4 alike of one kind, 5 alike and of another kind and the rest are all different. The total number of combinations is 240.

D

Number of selections that can be made of 6 letters from the word “COMMITIEE” is

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  13. Find the number of non-negative integral solutions of x1+x2+x3+4x4=20.

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