Multiple choice

Find the wrong number in the following number series. $3 4 16 75 366 1945$

  1. $16$
  2. $75$
  3. $366$
  4. $1945$
  5. $4$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Pattern: 1³-1=0 (not 3), 2³-4=4✓, 3³+48=75✓. Another pattern: differences: 1, 12, 59, 291, 1579. Try: ×1+1, ×4, ×4.5+3, ×4.7... The pattern 366 should be 291 (75×4-9). Actually pattern is: 3×1+1=4, 4×4=16, 16×4.5+11=85 (not 75), 75×4.6+126=471 (not 366). 366 is wrong.

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