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    Question

    If the first term of a geometric progression (GP) is 12

    and the common ratio is 4, then find the sum of its 4 terms.
    A 920 Correct Answer Incorrect Answer
    B 1020 Correct Answer Incorrect Answer
    C 1120 Correct Answer Incorrect Answer
    D 1220 Correct Answer Incorrect Answer

    Solution

    The sum of n terms of the geometric progression Where? a = first term, r = all ratio Sn=a(rn-1)/n-1 S4= 12(44-1)/ 4-1 = 4 × 255 = 1020

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