A(n)=2A(n-1)-X, A5=99, A3=27, X=?
answer:3
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sujaysolanki
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Nice one took me some time to figure out 
A5 = 99 A3 = 27
A5 = 2a4 - x
A4 = 2a3 - x
A5 = 2a4 - x
= 2 (2a3 - x) -x
NOw we know a5 = 99 and a3 = 27 ..Hence X on sloving comes to 3
A5 = 99 A3 = 27
A5 = 2a4 - x
A4 = 2a3 - x
A5 = 2a4 - x
= 2 (2a3 - x) -x
NOw we know a5 = 99 and a3 = 27 ..Hence X on sloving comes to 3
