CBSE math India

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Question 4.    Is 56 × 4 + 56 × 5 - 56 × 3 composite or prime? why?
Answer.            Is 56 × 4 + 56 × 5 - 56 × 3
                    = 56(4 + 5 - 3)
                    = 56 × 6
                        The given number has 2 factors other than 1, therefore it is composite.