Multiple choice

In the following number series find the missing term- 40320 26880 ? 16128 13440 11520

  1. 19530

  2. 22460

  3. 20160

  4. 21520

  5. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The pattern is multiply by 3/4 (or 0.75): 40320 × 3/4 = 26880, 26880 × 3/4 = 20160, 20160 × 3/4 = 15120... wait, that doesn't match. Let me check: 16128 × 3/4 = 12096, not 13440. Let me try: 40320, 26880 (×0.67), 20160 (×0.75), 16128 (×0.8), 13440 (×0.833), 11520 (×0.857). Actually, checking: 40320/26880 = 1.5, 26880/20160 = 4/3, 20160/16128 = 1.25, 16128/13440 = 1.2, 13440/11520 = 1.167. Hmm, let me try: 26880 = 40320 × 3/4? No, that's wrong. 26880 × 3/4 = 20160. 20160 × 4/5 = 16128. 16128 × 5/6 = 13440. 13440 × 6/7 = 11520. So the missing term is 20160 (26880 × 3/4).

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