Co-Prime and Twin Prime Numbers
Co-Prime and Twin Prime Numbers
Prime Numbers: A number which has only two different factors, 1 and the number itself is called prime number. e.g. 2, 3, 5, 7
Co-Prime Numbers: Two numbers are said to be co-prime when they have only 1 as common factor.e.g. 3 and 5: 19 and 20
Twin Prime Numbers: Two prime numbers whose difference is 2 are called are called Twin Prime Numbers. e.g. 3 and 5: 41 and 43.
Illustration: State whether the following numbers are co-prime or not.
(i) 4 and 17
(ii) 25 and 15
(iii) 13 and 19
(iv) 56 and 12
Solution: (i) As 4 and 17 have only 1 as common factor. Hence 4 and 17 are co-prime numbers.
(ii) As 25 and 15 have common factors as 5,1 . Hence 25 and 15 are not co-prime numbers.
(iii) As 13 and 19 have only 1 as common factor. Hence 13 and 19 are co-prime numbers.
(iv) As 56 and 12 have common factors as 2, 4,1. Hence 56, 12 are not co-prime numbers.
Illustration: How many twin prime numbers are there in between 90 and 100?
Solution: There are no Twin Prime Numbers between 90 and 100.
Twin primes are pairs of _______________________ . | |||
| Right Option : C | |||
| View Explanation | |||
Number of pairs of twin prime numbers between 1 and 50 are ______________ | |||
| Right Option : C | |||
| View Explanation | |||
If p and q are co-prime numbers then is p2 and q2 are also co-prime? | |||
| Right Option : A | |||
| View Explanation | |||
Students / Parents Reviews [10]
I have spent a wonderful time in Abhyas academy. It has made my reasoning more apt, English more stronger and Maths an interesting subject for me. It has given me a habbit of self studying
Yatharthi Sharma
10thOne of the best institutes to develope a child interest in studies.Provides SST and English knowledge also unlike other institutes. Teachers are co operative and friendly online tests andPPT develope practical knowledge also.
Aman Kumar Shrivastava
10thIt has a great methodology. Students here can get analysis to their test quickly.We can learn easily through PPTs and the testing methods are good. We know that where we have to practice
Barkha Arora
10thAbhyas Methodology is very good. It is based on according to student and each child manages accordingly to its properly. Methodology has improved the abilities of students to shine them in future.
Manish Kumar
10thAbout Abhyas metholodology the teachers are very nice and hardworking toward students.The Centre Head Mrs Anu Sethi is also a brilliant teacher.Abhyas has taught me how to overcome problems and has always taken my doubts and suppoeted me.
Shreya Shrivastava
8thIt was good as the experience because as we had come here we had been improved in a such envirnment created here.Extra is taught which is beneficial for future.
Eshan Arora
8thA marvelous experience with Abhyas. I am glad to share that my ward has achieved more than enough at the Ambala ABHYAS centre. Years have passed on and more and more he has gained. May the centre flourish and develop day by day by the grace of God.
Archit Segal
7thIt was a good experience with Abhyas Academy. I even faced problems in starting but slowly and steadily overcomed. Especially reasoning classes helped me a lot.
Cheshta
10thMy experience was very good with Abhyas academy. I am studying here from 6th class and I am satisfied by its results in my life. I improved a lot here ahead of school syllabus.
Ayan Ghosh
8thAbhyas is a complete education Institute. Here extreme care is taken by teacher with the help of regular exam. Extra classes also conducted by the institute, if the student is weak.
