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What number should replace the question mark in this sequence? 1 ; 5 ; 21 ; ? ; 341 ; 1365

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What number should replace the question mark in this sequence? 1 ; 5 ; 21 ; ? ; 341 ; 1365
posted Jan 23, 2018 by Nikita Sehgal

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1 Answer

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My answer is 85

1-5=4, 4*4=16
5-21=16, 16*4=64
21-85=64, 64*4=256
85-341=256, 256*4=1024
341-1365=1024

Multiply the subtracted answer with 4, we will get the answer which is the subtracted term of next two numbers. Is this logic is correct?

answer Jan 24, 2018 by Vishali T
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