Which of the following equation/s is/are correct? i)(a+b+c)2=a2+b2+c2−2(ab+bc+ca) ii)(a+b)3=a3+b3+3ab(a−b) iii)(a−b)3=a3−b3−3ab(a+b) iv)a2−b2=(a+b)(a−b)

Which of the following equation/s is/are correct? i)(a+b+c)2=a2+b2+c2

1.	Which of the following equation/s is/are correct? i)(a+b+c)2=a2+b2+c2−2(ab+bc+ca) ii)(a+b)3=a3+b3+3ab(a−b) iii)(a−b)3=a3−b3−3ab(a+b) iv)a2−b2=(a+b)(a−b)
Answer» Which of the following equation/s is/are correct? $i) (a + b + c)^{2} = a^{2} + b^{2} + c^{2} - 2 (a b + b c + c a)$ $i i) (a + b)^{3} = a^{3} + b^{3} + 3 a b (a - b)$ $i i i) (a - b)^{3} = a^{3} - b^{3} - 3 a b (a + b)$ $i v) a^{2} - b^{2} = (a + b) (a - b)$