5 billion | 28 Jul 2009

shabbir's Avatar, Join Date: Jul 2004
Go4Expert Founder
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.
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Kshiteej's Avatar, Join Date: Jul 2009
Contributor
0.
It would only take one person to have no fingers on their left hand to make it zero as anything multiplied by 0 is 0.
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Kshiteej's Avatar, Join Date: Jul 2009
Contributor
If all 5 billion people have 5 fingers on their left hand then the answer is 5^5 billion else answer will be 0 if any of this 5 billion people have no fingers on his/her left hand.
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mayjune's Avatar, Join Date: Jun 2009
Invasive contributor
Point 1 : In the above post, user has posted two answers in one post, using an If Else statement. So either the last answer in the post should be counted. Or it should be considered invalid, as this is not there in the rule - "only one answer per post."

Point 2 : Question is not clear, 5 fingers per person for only who have thumb or otherwise?
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SaswatPadhi's Avatar, Join Date: May 2009
~ Б0ЯИ Τ0 С0δЭ ~
Quote:
Originally Posted by shabbir View Post
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 View Post
... 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
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shabbir's Avatar, Join Date: Jul 2004
Go4Expert Founder
Quote:
Originally Posted by mayjune View Post
Point 1 : In the above post, user has posted two answers in one post, using an If Else statement. So either the last answer in the post should be counted. Or it should be considered invalid, as this is not there in the rule - "only one answer per post."

Point 2 : Question is not clear, 5 fingers per person for only who have thumb or otherwise?
5 fingers are considered and not 4 fingers and 1 thumb.

Many are close or I must say quite close but still no perfect answers.
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xpi0t0s's Avatar, Join Date: Aug 2004
Mentor
Zero, because there is at least one person with a missing left hand.
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xpi0t0s's Avatar, Join Date: Aug 2004
Mentor
So the answer is 1. because the length of the number zero is 1.

Or if you just want the length of 5^5000000000, that's easy enough too, with a little help from logs and a calculator:
5^5000000000=10^(log(5^5000000000))
=10^(5000000000*log(5))
5000000000*log(5)=3494850021.680094023931305526377 5

so the length of 5^5e9 is 3494850022
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shabbir's Avatar, Join Date: Jul 2004
Go4Expert Founder
Quote:
Originally Posted by xpi0t0s View Post
So the answer is 1. because the length of the number zero is 1.
Bingo
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SaswatPadhi's Avatar, Join Date: May 2009
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I thought we will end up with no current answer.
'coz every1 answered 0, but shabbir needed the length.

Congratz xpi0t0s.