a recursive function is defined by can=2an-1 with a0=1. find the value of a3

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$a_{0} = 1$

$ca_1=2a_0=>a_1=\dfrac{2}{c}$

$ca_2=2a_1=>a_2=\dfrac{4}{c^2}$

$ca_3=2a_2=>a_3=\dfrac{8}{c^3}$

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