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Logics and Riddles II Trivia Quiz

This is my second one in this category. Again, it's all about numbers. Enjoy.

A multiple-choice quiz by wimm. Estimated time: 3 mins.

Author
wimm

Time
3 mins

Type
Multiple Choice

Quiz #
48,517

Updated
Dec 03 21

# Qns
5

Difficulty
Average

Avg Score
3 / 5

Plays
16173

Last 3 plays: Guest 175 (2/5), Guest 120 (2/5), Guest 184 (2/5).

Question 1 of 5

1. Fill in the blank: 4, 9, 25, 49, 121, ... ? Hint

137

162

154

169

NEXT>

Question 2 of 5

2. Take a 3 by 3 square. The first row reads 1, 2, 3. The second: 4, 5, 6. The last one: 14, 19, xx Which number is missing?

Answer: (number)

NEXT>

Question 3 of 5

3. Fill in the blank: 1, 3, 5, 11, 21, 43, ...? Hint

NEXT>

Question 4 of 5

4. Can you divide 10230 by 3 and get a natural number?

Yes

NEXT>

Question 5 of 5

5. The sum of the even numbers between 1 and 21 equals?

Answer: (number)

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Most Recent Scores

Apr 04 2024 : Guest 175: 2/5
Mar 19 2024 : Guest 120: 2/5
Feb 28 2024 : Guest 184: 2/5
Feb 27 2024 : PurpleComet: 3/5
Feb 23 2024 : AndySed: 2/5

Score Distribution

Quiz Answer Key and Fun Facts

1. Fill in the blank: 4, 9, 25, 49, 121, ... ?

Answer: 169

The list is formed by the squares of the prime numbers. 13 is the next prime number, and 13 x 13 = 169.

2. Take a 3 by 3 square. The first row reads 1, 2, 3. The second: 4, 5, 6. The last one: 14, 19, xx Which number is missing?

Answer: 24

Multiply the first row by 2 and the second row by 3. The sum of this gives you row 3.

3. Fill in the blank: 1, 3, 5, 11, 21, 43, ...?

Answer: 85

Each number is the previous multiplied by 2 +-1. 3 = 1 x 2 +1, 5= 3 x 2 -1, 11 = 5 x 2 +1, etc... So 43 x 2 -1 = 85. Or another solution might be: if the first number is A and the second B then the third number C is = 2A + B

4. Can you divide 10230 by 3 and get a natural number?

Answer: Yes

To check if a number can be divided by 3, just add up all the figures from the number and if this sum can be divided by 3, so can the original number. So: 1+0+2+3+0=6 and 6 can be divided by 3.

5. The sum of the even numbers between 1 and 21 equals?

Answer: 110

The formula: (n x (n+2)):4 with 'n' the highest even number of the serie. So 20 x 22 : 4 equals 110...

Source: Author wimm

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