Finding Progression

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[Pandora] (https://www.worldhistory.org/Pandora/) has a box. She wants to open it but the catch is, there is a lock of four distinct number. The decryption of the lock is such a way that, the four numbers follow a progression either arithmetic progression or geometric progression. Pandora has already gussed first three numbers correctly. The three successive numbers of the sequence is $A ,B, C$. T

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L1 Observation

L2 Technique

L3 Approach

L4 Pseudo-code

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L5 Full solution

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solution.cppC++17

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