Question

Explain why 11 x 13 x 15 + 15 and 5 x 4 x 3 x 2 x 1 + 4 are composite numbers​

Answer 1

Answer:

in first case 15 is common

15(11x13+1)

15(143+1)

=15(144)

15and 144 are composite numbers

do the same for second case

Answer 2

Answer:

I can explain what composite numbers are

Basically

Composite Numbers are the numbers which have more than two factors.

Some examples are 9,4,6 etc

To find whether a number is composite or not here is an awesome trick

Find a square number that exactly exceeds that number.

Next

Take the number you have Squared and Write the prime numbers lesser than it.

Check if the number is divisible by any of those numbers.

Even if it is divided by at least one number in those that means it is a composite Number.

With this method we can easily find whether a number is Prime or Composite.

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