Is My Neighbour Right??

[kuiperbelt]

If you put one grain of rice on the first square of a chess board, then 2 grains on the second square, 4 grains on the third, 8 grains on the fourth and so on, until the 64th square, my neighbour reckons there would be 9.223372 x 10^18 grains of rice on the last square.

Is he right though? I calculate 2^64 (2 raised to the power of 64) equals 18.446744 x 10^18. Is my calculation right. I am not wrong, am I??

[bhg481]

2^0 =1 so the first square is cell 0

the last square is cell 63, so 2^63 grains on it = 9.22etc

[bobbinwales]

Yes as bhg said your wrong. You'd be right if you'd put 2 on the first square but you din't you only out one.... and you only double up 63 time's
..

[bobbinwales]

Now how many would there be in total

[bobbinwales]

I think I know but thought kuiperbely might want to have ago

[10ClarionSt]

Kuiperbely? What you trying to say?

[bhg481]

I think bobb has failed to notice that T is next to Y on the keyboard.

[bobbinwales]

I think bobb has got fat fingers and a tiny phone keypad too small even for a child

[ZebuSanctuary]

// Is my calculation right. I am not wrong, am I?? //

A little program which should help . Click on the link below;

https://zebusanctuary.github.io/ZebuSanctuary/

:-)

[kuiperbelt]

Thankyou bhg and bobbin!!
Not only am I a nit, I've now got to tell my neighbour I'm a nit. LOL

Zebu\little program which should help\
What can I say, other than BA!!

BTW, can you make it count more quickly. Say one tenth of a second??

[ZebuSanctuary]

// make it count more quickly. Say one tenth of a second? //

Here goes...

Additionally the count includes 334 squares.

This takes the number of grains to 1.7 googol on the last square.

[vulcan42]

Just tell your neighbour you thought he wanted to know how many grains of rice would be on the entire chess board.

[kuiperbelt]

\how many grains of rice would be on the entire chess board\
Thanx for the advice vulcan, unfortunately my answer would still be wrong by one :-( LOL

>08.24 Superb!!

[mibn2cweus]

9,223,372,036,854,775,808
so neighbor was closer but still short by
36,854,775,808

[mibn2cweus]

Happy stacking. This square of rice would reach beyond the Sun.