Question

Which of the following is not a composite number ?
a.) 5×7×9+9
b.) 2×3×5+9
c.) 2×5×7×11+2
d.) 2×5+9×11​

Answer 1

Answer:

A. 5×7×9+9

315+9 = 324

It's factors are 1 , 2, 3 , 4 , 6 , 9, 324 and many more.... So it has more than 2 factors.... So it's composite....

B. 2×3×5+9

30+9 = 39

Factors are 1 , 3 , 13 , 39....

Composite....

C. 2×5×7×11+2

772

Factors. 2 , 4 ,1 &772 Composite....

D.2×5+9×11

10+99 = 109

Factors 1&109

Not composite....

Hope it helps you mate....

Answer 2

The given question is that we have to find which us not the composite number among the following options.

composite number is a number that gets divided by many number.

The non composite number is a prime number which is divided by 1 and by itself.

let us find by calculating each number.

(a) 5*7*9+9

=35*9+9

=315+9=324

The factors of the number is 1,2,3,4,6,9,324,12,27.

(b) 2*3*5+9

=30+9=39

The factors of 39 are 1,13,39,3.

(c) 2*5*7*11+2

=770+2

=772

The factors of 772 are 2,4,193,386.

(d) 2*5+9*11

= 10+99

=109

The factors are 1 and 109.

the option 4 has no factors other than 1 and itself therefore it is not a composite number.

Hence the option (d) is the correct answer.

# spj2

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