Question

Explain why 7x11x 13+13 and 7 x 6 x 5 x 4x3x2x1+5 are composite numbers ​

Answer 1

Answer:

Cause when you it will take out the common than you will get more than 2 factors

Answer 2

Answer:  

7*11*13+13

13(7*11*1+1)    [we have taken 13 as common]  

13(77+1)

13*78

13*2*3*13*1  [multiples of 78]

Factors of given no. are 2,3,13,1

Since,it has factors apart from 1 and itself

therefore it is a composite no.

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

5(7*6*4*3*2*1*1+1)     [ taking 5 as common]

5(1009)

5*1009

5*1*1009

since, it has factors apart from 1 and itself

therefore, it is a composite no

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