# What is the probability of a couple having twins twice ?

another way to rephrase my question is, what is the probability a healthy female gies birth to twins the first time round, and then the second time she gets pregnant she delivers twins again ?

### 3 Answers

- Anonymous6 months ago
Someone get the quantum computer... Too complex to calculate. There are genetic predispositions, but not all multiples are genetically predisposed.

- Anonymous6 months ago
It has happened to some women before. You can get the odds by squaring the probability of having twins. For example, if the probability of having twins is x, then x times x is the probability of having 2 sets of twins.

That is how mathematicians figure out for example the chance of rolling a given number on dice. For example, the chance of rolling a 5 on dice is 1/6 since there are 6 numbers. The chance of rolling 2 fives in a roll is 1/6 x 1/6 = 1/36. That means if you roll the dice twice for 36 times, you may get 2 fives in a row once but there is no guarantee that you will roll 2 fives in a row even if you roll the dice a thousand times or more.

The chance of having twins is low among monkeys and apes, but it is much higher in humans because having twins increases the odds of surviving in a dangerous environment that humans evolved in. the African savanna. We evolved the ability for a woman to be pregnant soon after child birth, even though apes can only having one young at a time, and only once every 5-7 years. Apes live in an environment with few predators and they can climb trees to escape predators.

- billrussell42Lv 76 months ago
In 2009, the US rate is 16.7 twin sets (33.3 twins) per 1,000 births.

Other countries have different numbers, and it does vary by year...

assuming both are at the same probability, although I think you are more likely the second time...

first: 16.7/1000 = 0.0167

second: 0.0167x0.0167 = 0.000279

Source(s): wikipedia