### Brain Teasers

# Negative Consequence

Using the logical order of numbers listed below, can you guess what the last number in the sequence will be?

1

3

-1

2

-3

1

-5

??

What is the last number?

1

3

-1

2

-3

1

-5

??

What is the last number?

### Hint

Doesn't really amount to much of anything.### Answer

The last number is : 0The sequence starts with the number 1. Each number thereafter is found by alternating addition and subtraction. Numbers are added in the sequence 2, 3, 4. Numbers are subtracted in the order 4, 5, 6 etc. So basically, the sequence is found as follows: first number + 2 -4 + 3 -5 +4 -6 etc. The final number in the sequence would have 5 added to it, and would be a 0, as -5 + 5 = 0.

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