book Maths Puzzle Numerical Ability

Find a6 for an=8(1/2)^n, n=1,2,3,4,... I have no idea how to do this problem. Please help me.

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book Other Question

Simplify: 4-8sin^26x solve and write in scientific notation: (o.oo4 x 10^-5) ( 0.0003 x 10^-7