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Question

The third term of a G.P. is 4. The product of the first five terms is 
  1. 64
  2. 256
  3. 1024
  4. 512


Solution

The correct option is C 1024
a3=4ar2=4a1×a2×a3×a4×a5=a×ar×ar2×ar3×ar4=a5r10=(ar2)5=45=1024
 

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