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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.
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Joined: Fri May 15, 2009 8:33 am

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