Complete the series: 20, 24, 30, 32, 38, 42,__________.
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 48
Look at the differences between the terms:
24 − 20 = 4, 30 − 24 = 6, 32 − 30 = 2, 38 − 32 = 6, 42 − 38 = 4
Every second difference is 6, and the differences in between go 4, 2, 4. The next difference is therefore 6:
42 + 6 = 48