Multiple choice general knowledge math & puzzles

Insert the missing number. 4, -8, 16, -32, 64, (....)

  1. 128

  2. -128

  3. 192

  4. -192

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

The sequence follows a geometric progression where each term is multiplied by -2. 4 * (-2) = -8; -8 * (-2) = 16; 16 * (-2) = -32; -32 * (-2) = 64. The next term is 64 * (-2) = -128. Option 128 is incorrect because it misses the sign change.