Multiple choice

Find the missing number in the series: 4, 9, 19, 39, 79, ?

  1. 159

  2. 119

  3. 149

  4. 169
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The pattern is *2 + 1: 4*2+1=9, 9*2+1=19, 19*2+1=39, 39*2+1=79, 79*2+1=159.

AI explanation

The pattern is to multiply the previous term by 2 and then add 1, which is shown by (4 times 2) + 1 = 9 and (9 times 2) + 1 = 19. Applying this to 79 gives (79 times 2) + 1 = 159.

Keep practicing — related questions