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Logical Reasoning - Logical Problems

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36. A group of 30 students play cricket and football. 20 plays cricket and 15 plays football. Each student plays at least one game. How many of them plays both

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37. There are six books A, B, C, D, E and F. B, C, and E haye blue covers while the rest have red covers. D and F are new books while 'the rest are old books. A, C and D are law reports while the rest are of physics. Which is the red covered new law report book?

  • Option : D
  • Explanation :
    ABCDEF
    RedBlueBlueRedBlueRed
    OldOldOldNewOldNew
    LawPhyLawLawPhyPhy
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38. There are six books A, B, C, D, E and F. B, C, and E haye blue covers while the rest have red covers. D and F are new books while 'the rest are old books. A, C and D are law reports while the rest are of physics. Which two are old physics books and have blue cover

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39. There are six books A, B, C, D, E and F. B, C, and E haye blue covers while the rest have red covers. D and F are new books while 'the rest are old books. A, C and D are law reports while the rest are of physics. Which is blue covered, old and a law report book

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40. In a group of five persons A, B, C, D and . E one is a farmer, one is a physicist, one is a journalist, one is an industrialist and one is a doctor. A, C + doctor prefer tea to coffee and two of them B + Journalist prefer coffee to tea. Industrialist + D + A are friends but two of these prefer tea to office. The farmer is C's brother. Who is a farmer.

  • Option : A
  • Explanation : A + 'C + Doctor = Tea
    D + A + Industrialist = Coffee
    (only two of them)
    D + Industrialist = coffee
    B + Journalist = coffee
    B = Industrialist
    D = Journalist
    Subtracting B + D from A + B + C + D+E
    A + C + E = Tea
    A + 'C + Doctor = Tea'
    E = Doctor
    C's brother is a farmer
    A = Farmer
    C = Physicist is the last professional
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