Multiple choice

Find the missing term in the following number series. $12, 27, 77, 313, ?$

  1. $1480$
  2. $1559$
  3. $1320$
  4. $1149$

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

Analyze the pattern: 12 × 2 + 3 = 27, 27 × 3 - 4 = 77, 77 × 4 + 5 = 313. The multipliers increase by 1 (2, 3, 4, 5), and the additives alternate between addition and subtraction with consecutive odd numbers (+3, -4, +5, -6). Following this pattern: 313 × 5 - 6 = 1565 - 6 = 1559.

Keep practicing — related questions