It is known that the general term formula of the sequence an is an = 2 ^ (5-N), and the general term formula of the sequence BN is BN = n + K. let CN = BN (anbn). In the sequence {CN}, if C5

In fact, if C5 = A5, by C5 = A1, but the sequence an is decreasing, BN is increasing, so B5 > A5, get C5 = B5, which is contradictory to C5 = A5. So C5 = B5. And because BN is increasing, get CI = AI (I = 1,2,3,4), from the title, there must be B4 = - 4

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