CBSE Guess Official Helpline Forum for CBSE Students, Teachers and Parents. Educational Portals: ICSE | IGNOU | NIOS | IIT JEE | AIPMT | AIEEE | Friends
CBSE - Central Board of Secondary Education, CBSE India Guess Papers, CBSE Sample Papers, Tutors In India, CBSE Schools, CBSE Books.  
CBSE CBSE Papers CBSE Schools CBSE Alumni CBSE Tutors CBSE eBooks Educational Articles Indian Education Education Forum Fun Zone Fun Zones
IMPORTANT INFORMATION: To participate in this form you need to register as your login info will not work here. Click Here to Register

a maths question

Ask questions of CBSE Class X and discuss the same here. For any doubts relates to CBSE Class X.

a maths question

Postby himadri » Tue May 05, 2009 10:44 pm

hiii guys....i'm dealing with a prob in maths n hope you'll can solve it.
the question is:-
"Expalin why 7*11*13+13 and 7*6*5*4*3*2*1+5 are composite numbers?"
Posts: 7
Joined: Sun May 04, 2008 7:27 pm

Re: a maths question

Postby pspoornima » Fri May 15, 2009 9:17 am

Prime number is the natural number, which is greater than 1 and divisible by one and by itself only, is called a prime number.

For eg- 3, 3 is divisible 3 & 1

Composite number which is greater than 1 and is not prime and is called a composite number i.e it is divisble by number other than itself and 1.

For Eg- 8- divisible by 2,4,8,1.

In this case

7*11*13+13= 1014

1014 is divisible by 2,3,6,13,39,26

Since 1014 is divisible by more than the number itself and 1, it is a composite number.

7*6*5*4*3*2*1+5= 5045

5045 is divisible by 5 & 1009

Since 5045 is divisible by more than the number itself and 2, it is a composite number.
Posts: 5
Joined: Fri May 15, 2009 8:33 am

Return to CBSE Class X Helpline

Who is online

Users browsing this forum: No registered users and 8 guests