Multiple choice

Choose the correct alternatives from given ones that will complete the series. 30, 130, 630, ?

  1. 1260

  2. 3130

  3. 1030

  4. 3103
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The pattern is: multiply by 4 and add 10. 30*4 + 10 = 130, 130*4 + 10 = 530 (not 630), so there's an error. Check: 30 to 130 is *4 + 10. 130 to 630 should be 130*4 + 10 = 530, but it's 630 = 130*5 - 20. Next: if *5 - 20, then 630*5 - 20 = 3130. Or if *5 - 20: 30*5 - 20 = 130, 130*5 - 20 = 630, 630*5 - 20 = 3130. Yes, pattern is *5 - 20.

Keep practicing — related questions