1.

What should be subtracted from each number of the pattern? Choose the correct option. 15, 13, 11, 9, ___ 20, 17, 14, 11, ___ 25, 20, 15, 10, ___ 50, 40, 30, 20, ___

A. 7, 7, 15, 20     
B.           7, 8, 15, 20  
C.  7, 8, 5, 10      
D.           7, 8, 16, 10
Answer» D.           7, 8, 16, 10


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