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ICSE Class 10 Answered

The number of bacteria in a certain culture double every hour. If there were 30 bacteria  present in the culture originally, how many bacteria will be present at the end of 2nd hour, 4th hour and nth hour
Asked by jaiswalsindhuli717 | 01 Nov, 2018, 08:56: PM
answered-by-expert Expert Answer
According to the question,
30, 60, 120, 240....
This is GP with a = 30 and r = 2
Bacteria present after 2 hours = a3
a3 = ar2 = 30 (2)2 = 120
a5 = ar4 = 30 (2)4 = 480
Baceria present after n hours = an + 1
an = arn + 1 - 1 = 30 (2n)
Answered by Sneha shidid | 02 Nov, 2018, 09:57: AM
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