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16 . In how many different ways can the letters of the word 'OPTICAL' be arranged so that the vowels always come together?
A. 610 B. 720
C. 825 D. 920

17 . In how many different ways can the letters of the word 'CORPORATION' be arranged so that the vowels always come together?
A. 47200 B. 48000
C. 42000 D. 50400

18 . Out of 7 consonants and 4 vowels, how many words of 3 consonants and 2 vowels can be formed?
A. 24400 B. 21300
C. 210 D. 25200

19 . 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?
A. 159 B. 209
C. 201 D. 212

20 . A coin is tossed 3 times. Find out the number of possible outcomes.
A.  None of these B.  8
C.  2 D.  1




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