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
Answers
Answered by
6
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....
Answered by
0
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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