#### Holding two long poles, five fellows chase a herd of white buffalo into a cave. What is really going on here?

**Answer: ** They're eating rice with a pair of chopsticks.

**Solution: **

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#### When the celebrated German mathematician Karl Friedrich Gauss (1777-1855) was nine he was asked to add all the integers from 1 through 100. He quickly added 1 to 100, 2 to 99, and so on for 50 pairs of numbers each adding to 101. Answer: 50 X 101=5,050. What is the sum of all the digits in integers from 1 through 1,000,000,000? (That’s all the digits in all the numbers, not all the numbers themselves.)

**Answer: ** The numbers can be grouped by pairs:
999,999,999 and 0;
999,999,998 and 1'
999,999,997 and 2;
and so on....
There are half a billion pairs, and the sum of the digits in each pair is 81. The digits in the unpaired number, 1,000,000,000, add to 1. Then:
(500,000,000 X 81) + 1= 40,500,000,001.

**Solution: **

## Show Answer

The numbers can be grouped by pairs:

999,999,999 and 0;

999,999,998 and 1′

999,999,997 and 2;

and so on….

There are half a billion pairs, and the sum of the digits in each pair is 81. The digits in the unpaired number, 1,000,000,000, add to 1. Then:

(500,000,000 X 81) + 1= 40,500,000,001.

## Show Answer

The numbers can be grouped by pairs:

999,999,999 and 0;

999,999,998 and 1′

999,999,997 and 2;

and so on….

There are half a billion pairs, and the sum of the digits in each pair is 81. The digits in the unpaired number, 1,000,000,000, add to 1. Then:

(500,000,000 X 81) + 1= 40,500,000,001.

999,999,999 and 0;

999,999,998 and 1′

999,999,997 and 2;

and so on….

There are half a billion pairs, and the sum of the digits in each pair is 81. The digits in the unpaired number, 1,000,000,000, add to 1. Then:

(500,000,000 X 81) + 1= 40,500,000,001.

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