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KVPY Sample Paper KVPY Stream-SX Model Paper-22

  • question_answer
    The total number of combinations 6 at a time which can be formed from 6 alike white, 6 alike blue, 6 alike green & 6 alike red balls is:

    A) 90

    B) 84

    C) 78

    D) none of these

    Correct Answer: B

    Solution :

    [ 9 cases]  0 0 0 0 0 0 0 0 0\[={}^{9}{{C}_{3}}=84\] or co-eff. of \[{{x}^{6}}\]in \[{{(1+x+{{x}^{2}}+{{x}^{3}}+{{x}^{4}}+{{x}^{5}}+{{x}^{6}})}^{4}}\] Treat W, B, G, R as begger]


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