Intelligent Math Puzzle – Challenge 81
Enjoy solving math puzzles and critical thinking challenges? If so, then this challenge is just for you. The answer is also given.
Challenge:
What is the last number in the 18th row in the following pattern?
First row: 2
Second row: 3 4
Third row: 5 6 7
Fourth row: 8 9 10 11
…
A- 169
B- 170
C- 171
D- 172
E- 173
The Absolute Best Book to Challenge Your Smart Student!
$11.99
Satisfied 123 Students
The correct answer is D.
Each row has one number more than the previous row. The first row has one number, the second row has two numbers, and the 18th row has 18 numbers.
To answer the question, we should find the number of numbers in all 18 rows.
\(1 + 2 + 3 + … + 17 + 18 = \frac{18}{2}(1+18) = 171\)
The first number starts with 2. Therefore, the last number is 172 (171 +1).The Best Books to Ace Algebra
$14.99Satisfied 1 Students$14.99Satisfied 92 Students$15.99Satisfied 125 Students
Related to This Article
More math articles
- 10 Most Common 3rd Grade FSA Math Questions
- Getting a Math Degree: Hacks to Make Your Life Easier
- Praxis Core Math Worksheets: FREE & Printable
- How to Multiply Mixed Numbers? (+FREE Worksheet!)
- Calculations to Help Curb Your Rising Debt
- 10 Most Common 4th Grade MCAS Math Questions
- GRE Math Worksheets: FREE & Printable – Your Ultimate Preparation Tool!
- What is a Perfect SAT Score?
- How to Find Real Zeros of Polynomials
- How to Solve Word Problems with Four-digit Dividends and Two-digit Divisors
What people say about "Intelligent Math Puzzle – Challenge 81 - Effortless Math: We Help Students Learn to LOVE Mathematics"?
No one replied yet.