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r = 16/32= 1/2
Un= a . r ^(n-1) = 32 .( 1/2)^(n-1)
= 32 /(2^(n-1)
= 2^5/2^(n-1)
=2 ^(5-(n-1))
=2^(5-n+1)
=2^(6-n)