Answer :

As per question, the number of bacteria in a certain culture doubles every hour. So, they form a G.P. in which a = 30 and r = 2.

Bacteria present after 2^{nd} hour, 4^{th} hour and nth hour are T_{3}, T_{5} and T_{n+1} i.e., ar^{2}, ar^{4} and ar^{n}.

i.e., 30(2)^{2}, 30(2)^{4} and 30(2^{n}) respectively.

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