Seven Swans a Swimming

Probability Level 1

There are seven swans who each flip a fair coin once.

What is the probability of them all having a tail?

1 14 \frac { 1 }{ 14 } 7 127 \frac { 7 }{ 127 } 1 128 \frac { 1 }{ 128 } 1 2 \frac { 1 }{ 2 }

Angela Fajardo by Angela Fajardo , 19, Philippines

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1 solution

Angela Fajardo
Dec 29, 2015

Since the coin will be tossed 7 times, the number of outcomes will be: 2 7 { 2 }^{ 7 } = 128. There is only one possible outcome wherein all swans have a tail. So, the answer is 1 128 \frac { 1}{ 128 }

1 Helpful 0 Interesting 0 Brilliant 0 Confused

I was wondering if this problem was just straightfoward or if there was a pun somewhere... haha.

Stephen Phillips - 2 years, 7 months ago

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