5) Explain why 5 X 7 X 11 X 19 + 19 , is a composite number
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5 × 7 × 11 × 19 + 19
= 19[(5 × 7) + 1]
= 19 [35 + 1]
= 19 × 36
= 19 × 2 × 2 × 3 × 3
Here we see that 5 × 7 × 11 × 19 + 19 is having more than 2 prime factors so it is a composite number.
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