Multiple choice

Find the missing term in the following number series: 1620, 1600, 780, ?, 40, -12

  1. 280

  2. 260

  3. 240

  4. 320

  5. 340

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

Pattern: 1620÷2-10=800≠1600. Alternative: 1620-20=1600, 1600÷2-20=780, 780÷2-150=240, 240÷2-120=0≠40. Best pattern found: 1620-20=1600, (1600-40)/2=780, (780-300)/2=240, (240-120)/2=60≠40, (60-32)/2=14≠-12. Answer 240 is the best fit among options for the missing term.