Instructions
Choose the correct alternative from the given responses that will complete the series:
Solution
The logic here is
30 - 20 = 10
42 - 30 = 12
56 - 42 = 14
72 - 56 = 16
Difference between successive terms is increasing by 2.
The next difference will be 18.
Hence, next term = 72+18 = 90
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