Multiple Choice Questions on If p3 3p2 3p 7 then the value of p2 2p is ........ for SSC CGL Exam Preparation

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Multiple Choice Questions

If p3 3p2 3p 7 then the value of p2 2p is ........

Quantitative Aptitude (CGL) Algebra
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    If p3 + 3p2 + 3p = 7, then the value of p2 + 2p is

    4

    Incorrect Answer

    3

    Correct Answer

    5

    Incorrect Answer

    6

    Incorrect Answer
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    Explanation:

    p3 + 3p2 + 3p = 7
    ⇒ p3 + 3p2 + 3p + 1 = 7 + 1 = 8
    ⇒ (p + 1)3 = (2)3
    ⇒ p + 1= 2 ⇒ p = 1
    ∴ p2 + 2p = 1 + 2 × 1 = 1 + 2 = 3.

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