factorize a (a-1) - b (b-1)
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As we know that
a
2
−b
2
=(a+b)(a−b)
a(a−1)−b(b−1)=a
2
−a−b
2
+b
=a
2
−b
2
−a+b
=(a−b)(a+b)−(a−b)
=(a−b)(a+b−1)
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