Question

    Find the sum of geometric progression, 40, 20, 10, 5,

    …..
    A 64 Correct Answer Incorrect Answer
    B 48 Correct Answer Incorrect Answer
    C 25 Correct Answer Incorrect Answer
    D 80 Correct Answer Incorrect Answer

    Solution

    Sum of geometric progression (G.P.), Sum = a / [1 –r] Given, a = 40, r = 1/2 Sum = 40/ [1 – ½] ⇒ 40/[1/ 2] = 80

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