Each of the questions follows definite pattern. Observe the same and fill in the blanks with suitable answers.
The logic here is
1 + 2 = 3
2 + 3 = 5
3 + 5 = 8
5 + 8 = 13
8 + 13 = 21
From 3rd number, every number is the sum of the previous two numbers.
Hence the next number would be 21 + 13 = 34.
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