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ACT Aspire Math: Appreciating a Number in Its Prime 2 Views


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Description:

Which of the following is a prime number?


Transcript

00:03

Okay Aspiring math people We've got a quick one for

00:06

you Question which of the following is a prime number

00:14

All right Remember prime numbers can only be divided by

00:16

one and itself so it's defined as any number with

00:19

strictly to factors itself And one got that if we

00:23

drilled that into your brain with thes rules in mind

00:25

well let's just go through our answer choices One by

00:28

one zero can be divided by while literally any number

00:32

on the planet That's riel for relatively unexciting result of

00:36

zero So zero is not prime be one one may

00:40

look prime but remember that prime Numbers need 2 factors

00:44

1 is divisible by itself and one but since they're

00:46

the same number well a technically they don't count So

00:49

that's a no go On the other hand the number

00:51

two as in sea meets the criteria for prime numbers

00:54

perfectly because it's only factors are one into and that's

00:57

it So as it turns out to is the on

00:59

ly even prime number And that rules out for cause

01:02

of italy by one and two and four and finally

01:05

ninety three because it's divisible by while you could add

01:08

up the nine and three that gets you twelve and

01:11

twelve visible by three so right away we know it's

01:13

not crimes also visible by thirty one for you Strange

01:16

people in the back row with classes So that's it 00:01:18.322 --> [endTime] The answer is c were prime kind like amazon

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