Which of the following expressions is in the product-of-sums form?

1.	Which of the following expressions is in the product-of-sums form?
A.	(a + b )(c + d )
B.	(ab )(cd )
C.	ab (cd )
D.	ab + cd
Answer» B. (ab )(cd )

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Which of the following expressions is in the product-of-sums form?

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