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Question

Which of the following equations are correct?

(i) (a+b+c)2=a2+b2+c22(ab+bc+ca)
(ii) (a+b)3=a3+b3+3ab(ab)
(iii) (ab)3=a3b33ab(a+b)
(iv) a2b2=(a+b)(ab)


A

(iv) and (iii)

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B

(i) and (iv)

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C

(iv) only

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D

(ii), (iii) and (iv)

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