2. Which of the following is a sequence?a. Tupleb. RowC For

1.	2. Which of the following is a sequence?a. Tupleb. RowC For
Answer» TION:If f(N)−f(n−1)=Constant; then the sequence is an A.P.For each option, FIND f(n)−f(n−1)Option A:f(n)−f(n−1)=(an+b)−(a(n−1)+b) =an+b−an+a−b =a→Const∴ A → is in A.P.For other options, when we find an EXPRESSION for f(n)−f(n−1); we get an expression in variable n; and so is not constant; and hence, not an A.P.Ans→A

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