What is the missing number?

32

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40

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64

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80

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Solution

The correct option is B $40$
First term $= \sqrt{16}$
2nd number $= 8^{2} = 64$ .
3rd number $= 64 - 16 = 48$
4th term $= 64 + 8 = 72$
5th number $= 4^{2} = 16$ .
Hence, 64 replaces question mark.

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