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21 . In how many different ways can the letters of the word 'DETAIL' be arranged such that the vowels must occupy only the odd positions?
A. None of these B. 64
C. 120 D. 36

22 . A bag contains 2 white balls, 3 black balls and 4 red balls. In how many ways can 3 balls be drawn from the bag, if at least one black ball is to be included in the draw?
A. 64 B. 128
C. 32 D. None of these

23 . In how many different ways can the letters of the word 'JUDGE' be arranged such that the vowels always come together?
A. None of these B. 48
C. 32 D. 64

24 . In how many ways can the letters of the word 'LEADER' be arranged?
A. None of these B. 120
C. 360 D. 720

25 . In how many different ways can the letters of the word 'RUMOUR' be arranged?
A. None of these B. 128
C. 360 D. 180




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