Q: What is the percentage of a human having two heads?

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they are called human beings same as you or i

You cannot. The two are different things!

yes and i have seen one [ it wasn't pretty]

Three in eight are the odds of getting exactly two heads in three coin flips. There are eight ways the three flips can end up, and you can get two heads and a tail, a head and a tail and a head, or a tail and two heads to get exactly two heads.

The opposite of getting at most two heads is getting three heads. The probability of getting three heads is (1/2)^2, which is 1/8. The probability of getting at most two heads is then 1 - 1/8 which is 7/8.

Related questions

Bicephalous means having two heads (i.e. some aliens or monsters have two heads).

There are no known cases of humans having two heads. It is not biologically possible for a human to have two fully functional heads.

A dream of having two heads is probably the subconscious mind's way of saying that the dreamer has two contradicting beliefs, or is "of two minds" regarding some issue.

Yes there is a snake with two heads without tail, however such snakes are rarest of the rare.

they are called human beings same as you or i

No, caterpillars only have one head and two eyes. It is very rare for an animal/human to have 2 heads.

You cannot. The two are different things!

yes and i have seen one [ it wasn't pretty]

Assuming the coins are fair, two-sided coins, and landing on their sides is not an option, there are four possible outcomes if you consider coin a having a head and coin b having a tail being a different instance from coin a being a tail and coin be having a head. Here they are; Coin A | Coin B Heads | Tails Heads | Heads Tails....| Heads Tails....| Tails

The greens which four arms and two heads. Seriously, there is no superior race. But there are dominant genes.

The most limbs on a human ever reported is eight, which is known as octocephaly. This rare condition typically involves duplication of the head and upper extremities, resulting in an individual having two heads and a total of eight limbs.

The prefix for "having two feet" is "bi-," which means two.