In lm(response ~ terms), terms specification of the form "first*second" is same as __________

A)  first:second
B)  first+second
C)  first+second+first:second
D)  first:second+second:first

Correct Answer :   first+second+first:second

Explanation : A terms specification of the form “first + second” indicates all the terms in first together with all the terms in second with duplicates removed.

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