Question

is (3×4×5×7)+(19×21×23) a composite number justify your answer​

Answer 1

Answer:

9597 is a composite number.

Step-by-step explanation:

(3×4×5×7)+(19×21×23)

420+9177

=9597

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Answer 2

Answer:

By definition, a composite number is a whole number that can be divided evenly by numbers other than 1 or itself.

Let the number amount to y

Therefore, y=(3×4×5×7)+(19×21×23).

Now, notice that 3×7=21

Thus, y=(4×5×21)+(19×21×23)

Taking 21 common, we have:

y=21×((4×5)+(19×23))

Clearly, the number y will be divisible by 21 too.

Thus, the number is divisible by 1,y and 21 . Also, 21=3×7 , which implies that there are more than 2 distinct prime divisors, and thus, by definition the number y is a composite number.