Quote:

Originally Posted by **shabbir**
If you multiply together the number of fingers on every person's left-hands? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand) how long the number would be assuming 5 billion people on earth.

The only assumption here is we have 5 billion ppl on earth.

We don't know if we have exceptions like someone without fingers on left hand etc ..

There can be a lot of cases like some 1 has 1 finger, 2 fingers, 3 fingers .. no fingers etc..

And, I don't think it's possible to consider all of them.

Quote:

Originally Posted by **shabbir**
... how long the number would be ...

So.. i think the answer will be :

The length of the number is

= 5 billion * log(base 10) 5

= 5 * 10^9 * 0.69897000433601880478626110527551

= 3494850022 digits