Q.

How many bacteria are produced in four hours if a bacterium divides once in a half an hour?

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a

8

b

64

c

16

d

256

answer is D.

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Detailed Solution

4 hours= 240 minutes.The bacteria divide every 30 minutes.Therefore, no. of generation in 240 mins= 240/30=8 generations.Therefore, no. of bacteria after 240 minutes= 28= 256
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