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an = a1 * q^(n-1) = 16 * (1/2)^(n-1) = 2^4 * (1/2)^n * 2 = 2^5 * (1/2)^n = 2^5 * 2^(-n) =2^(5-n)
an = 2^(5-n)
a5 = 2^0 = 1