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Logics and Riddles I Trivia Quiz

I really enjoy playing quizzes that require a little activity of both braincells. Because I think European people have some troubles with the word puzzles, my first little quiz deals with numerical stuff. Enjoy!

A multiple-choice quiz by wimm. Estimated time: 6 mins.

Author
wimm

Time
6 mins

Type
Multiple Choice

Quiz #
48,182

Updated
Dec 03 21

# Qns
5

Difficulty
Difficult

Avg Score
2 / 5

Plays
7653

Question 1 of 5

1. Fill in the blank. 1, 2, 5, 10, 17, 26, ...?

Answer: (number)

NEXT>

Question 2 of 5

2. I give you a few numbers, I'd like you to give me the next one: 1, 11, 21, 1211, ? Hint

13112

21221

1122111

111221

NEXT>

Question 3 of 5

3. Fill in the blank: 1, 3, 6, 11, 20, 37, ...

Answer: (number)

NEXT>

Question 4 of 5

4. Take a 3 by 3 square. The first row reads: 3, 5, 8. The second one: 4, 1, 7 and the last one: 14, 12, ... Which number is missing?

Answer: (number)

NEXT>

Question 5 of 5

5. What's the sum of the numbers 1 to 20 (inclusive)?

Answer: (number)

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Quiz Answer Key and Fun Facts

1. Fill in the blank. 1, 2, 5, 10, 17, 26, ...?

Answer: 37

Every number is a square + 1. 1=0x0+1, 2=1x1+1, 5=2x2+1, ... So 37=6x6+1. Another solution could be: 'you are adding continously higher odd numbers. 1+1 2+3 5+5 10+7 etc' was pointed out to me by Machiabelly...

2. I give you a few numbers, I'd like you to give me the next one: 1, 11, 21, 1211, ?

Answer: 111221

When you read it very slow, you'll see. The first number reads : one times 1. The second one reads: two times 1. So, the number we search for is: one times 1, one times 2, two times 1.

3. Fill in the blank: 1, 3, 6, 11, 20, 37, ...

Answer: 70

The number 2 is the clue here. when you multiply '2' n-times with itself and ad n to the result, you become this row. Starting with n=0, you get 1 (a number to the power zero equals always 1) + 0 = 1. For n=1, we get 2+1=3. For n=2 we get 2x2+2=6. We were looking for n=6 : 2x2x2x2x2x2+6 = 70

4. Take a 3 by 3 square. The first row reads: 3, 5, 8. The second one: 4, 1, 7 and the last one: 14, 12, ... Which number is missing?

Answer: 30

The third row is the sum of row 1 and row 2 multiplied by two...

5. What's the sum of the numbers 1 to 20 (inclusive)?

Answer: 210

The formula to calculate the sum of n numbers is (n x (n+1))/2

Source: Author wimm

This quiz was reviewed by FunTrivia editor gtho4 before going online.
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