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25 July, 10:05

Every minute a computer sends a virus to 5 new computers. The following minute the original computer sends it's virus to 5 be computers, and each computer that received it the 1st minute sends it to 5 more. This pattern continues until someone figures out how to stop it. Write an equation to represent this situation.

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  1. 25 July, 10:17
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    Initially, you start with 1 computer with the virus

    a0=1

    after the first minute you have 5 new computers with virus

    a1 = a0+a0*5 = a0*6

    after the 2nd minute, all those computers (6) will have infected 5 computers each

    a2 = a1+a1*5 = a1*6

    keep going

    a3=a2+a2*5 = a2*6 = a1*6*6 = a0*6*6*6 = a0*6^3

    so it reasons after the nth minute the number of computers infected (an) can be represented as

    an = a0 * 6^n
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