The Puzzler – Week 17

Registration is now open for the next contest!
 
Welcome to The Puzzler. Every week, there are 2 new puzzles related to my passion: math, logic, and thinking. The first puzzle will be The Puzzler Quik, meant for those who crave something fun-sized. The second puzzle will be The Puzzler Think, meant for those who love to ponder. The answers will be posted in next week’s column. Don’t forget to submit your answer for a potential shout-out in the next edition of the Puzzler.
 
 

Puzzler Quik

Mr. Smith has two children. At least one of them is a boy. What is the probability that both children are boys?

Puzzled?

The answer is not 1/2

Puzzler Think

What is the sum of the first 100 counting numbers?

Confused? Just watch this video on Arithmetic Sequences!

 

Puzzled?

Think of the hundred numbers as an Arithmetic Sequence!

Last Week's Puzzler Quik

MathJams from New York was the winner of this shout-out.

Here is an explanation:  

For a number to be 3 digits, its hundreds digit must be non-zero. As a result, we have 9 choices for the hundreds digit, 10 choices for the tens digit (since it can be zero) and 1 choice for the ones digit since it must be the same as the hundreds digit. This results in an answer of 9*10*1=90.

Last Week's Puzzler Think

This week’s shout out goes to Carter from San Diego, California! Kudos to him!

There was no best way to solve this problem with a written explanation, so ThePuzzlr made a video!

 

 

2 thoughts on “The Puzzler – Week 17”

  1. Based on the difficulty level of each puzzle, was the quik puzzle meant to be the think puzzle and vice versa? My apologies if this is wrong (as it likely is) but it just kind of seemed that way.

    Thank you so much!
    cw357

  2. Pingback: The Puzzler – Week 18 -

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