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Two girls and four boys are to be seated in a row in such a way that the girls do not sit together. In how many different ways can it be done?
(a)
(b)
(c)
(d)

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Important Questions on Permutation and Combination
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If the number of all possible permutations of the letters of the word in which the repeated letters are not together is
, then
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How many numbers of four digits can be made by using the digits and ? (Repetition of digits is not allowed)

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In how many ways the letters of word 'MACHINE' can be arranged so that vowels will always be together?

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