Question

please send me the correct and step by step answer please......​

Answer 1

Answer:

7×11×13+13

=13(7×11×1+1)

=13(77+1)

=13(78)

Step-by-step explanation:

Since,from the above it can be seen that the above expression has 13,78,1 and itself as the factors (i.e more than two factors ) .

Therefore,it is composite numbers.

Next part of question follows similar procedure.

Answer 2

Answer:

1.    7 * 11 * 13 + 13

     13 (7 * 11 * 1 + 1)

     13 (7 * 11 + 1)

     13 * 78

It means 7 * 11 * 13 + 13 has 13 and 78 as its factors.

Hence, 7 * 11 * 13 + 13 is a composite number

2.    7 * 6 * 5  * 4 * 3 * 2 * 1 + 5

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

      5 ( 1008 + 1)

      5 * 1009

It means  7 * 6 * 5  * 4 * 3 * 2 * 1 + 5 has 5 and 1009 as its factors.

Hence,  7 * 6 * 5  * 4 * 3 * 2 * 1 + 5 is a composite number.

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