Brilliant

Today Courses

Practice

Algebra
Geometry
Number Theory
Calculus
Probability
Basic Mathematics
Logic
Classical Mechanics
Electricity and Magnetism
Computer Science
Quantitative Finance
Chemistry

rocket with vector

Excel in math and science.

Log in with Facebook Log in with Google Log in with email

Join using Facebook Join using Google Join using email

Forgot password? New user? Sign up

Existing user? Log in

rocket with vector

Your answer seems reasonable. Find out if you're right!

Sign up to access problem solutions.

That seems reasonable. Find out if you're right!

Sign up to save your progress!

Log in with Facebook Log in with Google Log in with email

Join using Facebook Join using Google Join using email

Forgot password? New user? Sign up

Existing user? Log in

Arithmetic Progressions

Intro

Concept Quizzes

Arithmetic Progressions Warmup
Arithmetic Progression Properties
Finding the Common Difference - Arithmetic Progressions
Finding the nth Term - Arithmetic Progressions
Arithmetic Progression Comparisons
Arithmetic Mean
Arithmetic Progression Sum
Arithmetic Progressions - Problem Solving

Challenge Quizzes

Arithmetic Progressions: Level 1 Challenges
Arithmetic Progressions: Level 2 Challenges
Arithmetic Progressions: Level 3 Challenges
Arithmetic Progressions: Level 4 Challenges

Arithmetic Mean

What is the arithmetic mean of $3a +15$ and $7a -9$ ?

10a+6

5a+3

5a+7

10a+3

Show explanation

View wiki

by Brilliant Staff

$8, x, 16, 18$

If the average of the above numbers is 13, what is $x$ ?

11 10 13 12

Show explanation

View wiki

by Brilliant Staff

What is the arithmetic mean of all the prime numbers less than 20?

\frac{92}{9}

\frac{77}{8}

\frac{75}{8}

\frac{58}{7}

Show explanation

View wiki

by Brilliant Staff

What is the arithmetic mean of all the leap years in the $19^{\text{th}}$ century?

Details and Assumptions:
A year that is divisible by 4 is a leap year. However, a year that is divisible by 100 but not by 400 is a common year.

The $19^{\text{th}}$ begins with January 1, 1801 and ends with December 31, 1900.

1848 1851 1850 1852

Show explanation

View wiki

by Brilliant Staff

$-10, -6, -2, 2, 6, 10$ What is the arithmetic mean of the above sequence?

-2 2 0

Show explanation

View wiki

by Brilliant Staff

×

Problem Loading...

Note Loading...

Set Loading...