3 years ago

|-7n+4|+9=34How do you do this?

1 answer:

6 0

$|-7n+4|+9=34\\\\ |-7n+4|=25\\\\ -7n+4=25 \vee -7n+4=-25\\\\ 7n=-21 \vee 7n=29\\\\ n=-3 \vee n=\dfrac{29}{7}$

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For each coin, there are 2 outcomes, heads (H) or tails (T), so for the 3 coins, the number of outcomes are:

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HHH / HHT / HTH / THH / TTT / TTH / THT / HTT

Out of all these outcomes, there are 3 ways, we get exactly 2 Heads:

HHT / HTH / THH

So, the probability of exactly 2 coins landing on Heads is 3/8, or 0.375

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