Friday

April 18, 2014

April 18, 2014

Posted by **Monica** on Saturday, October 7, 2006 at 2:06pm.

Very Simple Question

How would you solve it:

(1+x^2)(1-x^3)

(1+x^2)(1-x^3)

This is the same as

1*(1-x^3) + (x^2)*(1-x^3) = 1 - x^3 + x^2 - x^5

We have

1 who call 3

1+3 who call 3

1+3+9 who call 3

1+3+9+27 who call the remaining 60 who don't need to call anyone.

So it looks like 40 will need to call someone and 60 won't need to call anyone. If I understand the question correctly.

Check that, of the last 27 who need to call, not everyone made a call. There were 60 people remaining to be called and only 20 of the 27 needed to call someone. 7 of the 27 didn't need to call anyone, so 67 people total did not need to call anyone. Check this too.

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