NCERT Exercise 1.1 - Q6 - Real Numbers

Question: Explain why 7 * 11 * 13 + 13 and 7 * 6 * 5 * 4 * 3 * 2 * 1 + 5 are composite numbers.

Answer: Both expressions can be factorized into products of prime integers other than 1 and themselves, proving they are composite numbers.

Full step-by-step NCERT solution with diagrams on Something by Zero.