How many grains of wheat will be on square 12 if there was 1 grain placed on square 1, 2 grains on square 2, 4 grains on square 3, and 8 grains on square 4?

In the question, it is given that 1 grain placed on square 1, 2 grains on square 2, 4 grains on square 3, and 8 grains on square 4 .

The series is

1,2,4,8,16

As we see that in each square , the number of grains placed = 2^{n-1}.

Here n is the square number .

In the question , we need to find the number of grains placed on 12th square . And for that we have to plug n=12 that is

2^{12-1} =2^{11} = 2048

So the number of grains placed on square 12 is 2048 .

(a) the volume of the cone is 20/3 in3

hence, option a is correct.

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