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 shabbir 28Jul2009 17:41

5 billion | 28 Jul 2009

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.

 Kshiteej 28Jul2009 18:00

Re: 5 billion | 28 Jul 2009

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.

 Kshiteej 28Jul2009 18:05

Re: 5 billion | 28 Jul 2009

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.

 mayjune 28Jul2009 19:17

Re: 5 billion | 28 Jul 2009

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?

Re: 5 billion | 28 Jul 2009

Quote:
 Originally Posted by shabbir (Post 53735) 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 (Post 53735) ... 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

 shabbir 28Jul2009 20:24

Re: 5 billion | 28 Jul 2009

Quote:
 Originally Posted by mayjune (Post 53742) 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.

 xpi0t0s 28Jul2009 20:28

Re: 5 billion | 28 Jul 2009

Zero, because there is at least one person with a missing left hand.

 xpi0t0s 28Jul2009 20:37

Re: 5 billion | 28 Jul 2009

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

 shabbir 28Jul2009 21:50

Re: 5 billion | 28 Jul 2009

Quote:
 Originally Posted by xpi0t0s (Post 53751) So the answer is 1. because the length of the number zero is 1.
Bingo

Re: 5 billion | 28 Jul 2009

I thought we will end up with no current answer.
'coz every1 answered 0, but shabbir needed the length.

Congratz xpi0t0s. :happy:

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