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pls explain the concept of prime no
The numbers from 61 to 70 are: 61, 62, 63, 64, 65, 66, 67, 68, 69, 70 Prime numbers: 61, 63, 67, 69
do you know what "prime number " means?
i m confused
the prime numbers are 61 & 67 only
lol prime is not odd!
prime means only divisors are 1 and itself, a whole number that you cannot factor
so the probability is 2/10 = 1/5
we can try the numbers one by one and check
okay,pratu u were mistaken
61, 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
62 is even, so it is divisible by 2, not prime. and neither are 64,66,68,70 for the same reason
63 is divisible by 3 because \[63=3\times 21\]
why did u take such a big no?
65 is obviously divisible by 5 67 is prime and finally 69 is divisible by 3
I 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 ?
Can 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.
well sorry i m a lost in maths
Yeah, I made a mistake and had some internet problem in the middle so couldn't reply. The others are right though.
some 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