Ask Singapore Homework?
Upload a photo of a Singapore homework and someone will email you the solution for free.
Question
junior college 2 | H2 Maths
3 Answers Below
Anyone can contribute an answer, even non-tutors.
Pls help me. Thank you
Date Posted: 4 years ago
Views: 591
The last part answer is actually 60
Ok, will have a look at the last part
See 3 Answers
done
{{ upvoteCount }} Upvotes
clear
{{ downvoteCount * -1 }} Downvotes
Might be wrong.
Date Posted:
4 years ago
The answer for the last part is 60 actually
The prime numbers also include 1 and 5?
Eh ya forgot that 5 is prime. Ouch, that was a primary mistake of mine. 1 is not prime.
Certainly if 3 of the prime numbers are prime, even though we can pick the first two digits as non-prime, the last digit by default is prime.
So all combinations of the numbers will be prime.
There are 60 numbers which are prime.
Certainly if 3 of the prime numbers are prime, even though we can pick the first two digits as non-prime, the last digit by default is prime.
So all combinations of the numbers will be prime.
There are 60 numbers which are prime.
done
{{ upvoteCount }} Upvotes
clear
{{ downvoteCount * -1 }} Downvotes
Sorry, I got so deep into thought and mistook the question “there exists at least one prime number in the 3 digits” as “the number of 3-digit prime numbers and this led me into thinking that all 3-digit numbers ending in 5 are not prime, so I ruled out 5. Forgot that the question asked for the digits and not the entire number.
Date Posted:
4 years ago
Its okay. Thank you
360 Tutoring Program