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Geometric Sequences

A bacteria do...

Question

A bacteria doubles itself every day. If on day 1 there were only 1 bacteria, then how many of them will be there at the end of the 6th day?

A

40

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B

28

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C

24

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D

32

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Solution

The correct option is D 32
The bacteria doubles everyday.
Day 1 → 1
Day 2 → 1 × 2 = 2
Day 3 → 2 × 2 = 4
Day 4 → 4 × 2 = 8
Day 5 → 8 × 2 = 16
Day 6 → 16 × 2 = 32

So, at the end of the 6th day, there will be 32 of them.

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