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anonymous
 4 years ago
A positive integer is picked randomly from 61 to 70, inclusive.
What is the probability that it is prime?
anonymous
 4 years ago
A positive integer is picked randomly from 61 to 70, inclusive. What is the probability that it is prime?

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anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0pls explain the concept of prime no

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0The numbers from 61 to 70 are: 61, 62, 63, 64, 65, 66, 67, 68, 69, 70 Prime numbers: 61, 63, 67, 69

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0do you know what "prime number " means?

hoblos
 4 years ago
Best ResponseYou've already chosen the best response.0the prime numbers are 61 & 67 only

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0lol prime is not odd!

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0prime means only divisors are 1 and itself, a whole number that you cannot factor

hoblos
 4 years ago
Best ResponseYou've already chosen the best response.0so the probability is 2/10 = 1/5

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0we can try the numbers one by one and check

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0okay,pratu u were mistaken

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.061, 62, 63, 64, 65, 66, 67, 68, 69, 70 61 is prime because it is not the product of any two numbers. think about the multiplication table. 61 does not appear as an entry there

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.062 is even, so it is divisible by 2, not prime. and neither are 64,66,68,70 for the same reason

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.063 is divisible by 3 because \[63=3\times 21\]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0why did u take such a big no?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.065 is obviously divisible by 5 67 is prime and finally 69 is divisible by 3

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0I think a better question is how do you know if a number is a prime. We know that all even numbers are not prime. But which of the odd ones are prime. I guess the question is how would you calculate if a number is or is not prime? For example, 3335679 ?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Can this only be done by brute force. i.e. take each integer and start dividing by the smaller integers and then keep going until you reach an answer without a remainder? We need a mathematician.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0well sorry i m a lost in maths

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Yeah, I made a mistake and had some internet problem in the middle so couldn't reply. The others are right though.

hoblos
 4 years ago
Best ResponseYou've already chosen the best response.0some notes that may help: if the number is even then it is divisible by 2 if the sum of digits of the number is divisible by 3 then the whole number is divisible by 3 if the number ends with 0 or 5 then it is divisible by 5 out of these cases you have to try dividing by PRIME numbers until you reach an answer without a remainder
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