The common difference of 1/6,1/3 , 1/2, 2/3, is 1/6. Becaust it is an arithmetic progression,1/6 is the common difference. 1/6+1/6=1/3,1/3+1/6=1/2,1/2+1/6=2/3.

The common ratio of 1/12 1/6 1/3 is 2. Becuase it is geometric sequence. 2 is the common ratio. 1/12*2=1/6,1/6*2=1/3.

The homogeneous region is a type of region defined by a greater similarity among the units that compose it than with units belonging to other regions. article252

Added 176 days ago|6/29/2014 3:09:59 AM

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