Question

Find the next number in the series:
21, 25, 33, 49, 81,​

Answer 1

Answer:

145 is the right answer

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Answer 2

Answer: 145

Step-by-step explanation:

Each number is increasing by twice itself. I mean first it is increased by 4, then 8, then 16, then 32 and now to get  the answer, you need to add 64.