Question

Explain why 9×13×15+15 and 9× 8×7×6×5×4×3×2×1+5 are composite number

Answer 1

it is a composite number because when we will multiply them and take out common from them there will be more than one factor or two factor which will divide the number. therefore they are composite numbers. Here is ur answer......
IN 1ST CASE;
9× 13× 15+ 15
15( 9×9×13+1)
15× 1054
15810.
IN 2ND CASE;
9×8×7×6×5×4×3×2×1+5
5( 9×8×7×6×4×3×2×1+1)
5× 72577
362885.
HOPE IT HELPS.....

Answer 2

Hi there!

→ What are Composite numbers? ←

They are whole number that can be divided exactly by numbers other than 1 or itself. 

ATQ,

♦ 9 × 13 × 15 + 15

15 × (9 × 13 + 1)

15 × (117 + 1)

15 × 118

1770

∵ It has more than 2 factors i.e. 9, 13, 14, 1 etc.

Therefore,
It's a Composite number

♦ 9 × 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1 + 5

5 × (9 × 8 × 7 × 6 × 4 × 3 × 2 + 1)

5 × (72576 + 1)

5 × (72577)

362885

∵ It has. ore than 2 factors i.e. 9, 8, 6, 7, 5, 1 etc.

Therefore,
It's a Composite number

Hope it helps! :)