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# Consider an arithmetic series and a geometric

Question:

Consider an arithmetic series and a geometric series having four initial terms from the set $\{11,8,21,16,26,32,4\}$. If the last terms of these series are the maximum possible four digit numbers, then the number of common terms in these two series is equal to_________.

Solution:

GP : $4,8,16,32,64,128,256,512,1024,2048$,

4096,8192

AP : $11,16,21,26,31,36$

Common terms : $16,256,4096$ only