# Trial and Error

It could be easier or faster to solve a problem by guessing what the answer is. Especially for multiple choice questions, simply plug in the given options and check which of them satisfy the conditions.

What is the solution to $$2x + 3 = 999$$?

A) 49
B) 498
C) 499
D) 501
E) 999

Solution: Trying the first option, $$2 \times 49 + 3 = 101 \neq 999$$.
Trying the second option, $$2 \times 498 + 3 = 999$$. The answer is B.

Note by Arron Kau
4 years, 1 month ago

MarkdownAppears as
*italics* or _italics_ italics
**bold** or __bold__ bold
- bulleted- list
• bulleted
• list
1. numbered2. list
1. numbered
2. list
Note: you must add a full line of space before and after lists for them to show up correctly
paragraph 1paragraph 2

paragraph 1

paragraph 2

[example link](https://brilliant.org)example link
> This is a quote
This is a quote
    # I indented these lines
# 4 spaces, and now they show
# up as a code block.

print "hello world"
# I indented these lines
# 4 spaces, and now they show
# up as a code block.

print "hello world"
MathAppears as
Remember to wrap math in $$...$$ or $...$ to ensure proper formatting.
2 \times 3 $$2 \times 3$$
2^{34} $$2^{34}$$
a_{i-1} $$a_{i-1}$$
\frac{2}{3} $$\frac{2}{3}$$
\sqrt{2} $$\sqrt{2}$$
\sum_{i=1}^3 $$\sum_{i=1}^3$$
\sin \theta $$\sin \theta$$
\boxed{123} $$\boxed{123}$$