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Multiple choice

The sum of the series 9, 5, 1,…. to 100 terms is

    • 18900
  1. 18900

  2. 19900

  3. None of these

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Arithmetic progression: a=9, d=-4, n=100. Sum = n/2 * (2a + (n-1)d) = 50 * (18 + 99 * -4) = 50 * (18 - 396) = 50 * -378 = -18900.

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