Quantitative Aptitude - Permutation And Combinations

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16. The number of words from the letters of the word `BHARAT' in which B and H will never come together, is

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17. The number of different signals which can be given from 6 lags of different colours taking one or more at a time, is

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18. Ten different letters of an alphabet are given. Words with five letters are formed from these given letters. Then the number of words which have at least one letter repeated is

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19. If sides AB, BC, CA of a triangle ABC have 3, 4 and 5 interior points respectively on them, then total number of triangles that can be constructed by using these points as vertices, is

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20. A student can take one of four Mathematics sections and one of five English sections. The number n of ways he can register for the two courses, is

  • Option : C
  • Explanation : There are four choices for Mathematics and five choices for English. n = 4 x 5=20
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