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# Sunday Afternoon Maths XL

Posted on 2015-03-08

## The sixth cent

You toss 6 fair coins, and I toss 5 fair coins. What is the probability that you get more heads than I do?

## One hundred factorial

How many zeros does $$100!$$ end with?

## Two triangles

Source: Maths Jam
The three sides of this triangle have been split into three equal parts and three lines have been added.
What is the area of the smaller blue triangle as a fraction of the area of the original large triangle?
If you enjoyed these puzzles, check out Advent calendar 2020,
puzzles about time, or a random puzzle.

## Archive

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