Are you ready for a fun challenge? This brain teaser tests your ability to recognize patterns and apply logical reasoning. The puzzle may seem simple at first glance, but there’s a twist—you can arrive at two different correct answers, depending on your approach.

Think you can crack the code? Let’s dive in and explore the logic behind this intriguing number sequence!

Why This Puzzle Is Tricky

One of the most common mistakes people make when tackling this type of puzzle is assuming a simple arithmetic rule—such as basic addition or multiplication. However, many brain teasers incorporate hidden patterns that require a deeper level of thinking.

To solve this challenge, you’ll need to step back and analyze how each equation builds upon the previous one. Let’s break it down step by step!

The Puzzle: Find the Missing Number

Here’s the given number sequence:

• 1 + 4 = 5
• 2 + 5 + 5 = 12
• 3 + 6 + 12 = 21
• 4 + 7 + 21 = 32
• 5 + 8 + ? = ???

Can you figure out what number should replace the question mark?

There are two possible solutions to this puzzle, depending on how you interpret the pattern. Let’s explore both approaches.

Solution #1: Using a Cumulative Addition Pattern

In this method, we recognize that each equation builds upon the previous result. Here’s the breakdown:

• Step 1: 1+4=51 + 4 = 51+4=5
• Step 2: 2+5+5=122 + 5 + 5 = 122+5+5=12 → (2, next number is 5, then add previous result 5)
• Step 3: 3+6+12=213 + 6 + 12 = 213+6+12=21 → (3, next number is 6, then add previous result 12)
• Step 4: 4+7+21=324 + 7 + 21 = 324+7+21=32 → (4, next number is 7, then add previous result 21)
• Step 5: 5+8+32=455 + 8 + 32 = 455+8+32=45 → (5, next number is 8, then add previous result 32)

So, the missing number in this logic is 45.

Solution #2: Using a Slightly Different Pattern

Another valid way to interpret this puzzle follows a different additive approach, adjusting the way the previous sum is carried forward. Let’s examine it:

• Step 1: 1+4=51 + 4 = 51+4=5
• Step 2: 2+5+5=122 + 5 + 5 = 122+5+5=12
• Step 3: 3+12+6=213 + 12 + 6 = 213+12+6=21 → (Instead of adding the previous result directly, we use a modified sequence)
• Step 4: 5+21+8=345 + 21 + 8 = 345+21+8=34

So, the missing number in this interpretation is 34.

Which Answer Is Correct?

Both 45 and 34 are technically correct—each depending on how you apply the sequence pattern. This is what makes the puzzle so fascinating! It forces you to think outside the box and explore multiple ways of reasoning.

What This Puzzle Teaches Us About Problem-Solving

Video: What’s the Missing Number [1-100 Version] (Can you figure out the MISSING number?)

Solving brain teasers like this one is great mental exercise because it:

• Encourages logical reasoning – You have to identify hidden patterns.
• Strengthens problem-solving skills – Finding multiple correct solutions expands your thinking.
• Boosts attention to detail – Small variations in interpretation can lead to different answers.

This puzzle is a great reminder that there’s not always just one right way to approach a problem. Sometimes, multiple solutions can be equally valid!

Final Thoughts: Can You Solve It?

Now that you’ve seen both approaches, which answer did you get? Did you find a different logic that works?

Drop your solution and explanation in the comments! And if you love puzzles like this, keep challenging yourself with more brain teasers to sharpen your skills.