Question 72

Find the missing (?) in the series.

3, 5, 9, ?, 33, 65

Solution

$$2^1+1=2+1=3$$

$$2^2+1=4+1=5$$

$$2^3+1=8+1=9$$

$$2^4+1=16+1=17$$

$$2^5+1=32+1=33$$

$$2^6+1=64+1=65$$

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