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Question

Factorise:

(i) 7m + 21n

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Solution

7m + 21n
7m = 7 × m
21n = 3 × 7 × n
Here, 7 is the common factor of the given terms.
Hence, 7m + 21n = 7 (m + 3 × n)
= 7 (m + 3n)

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