If the polynomial has three roots in arithmetic progression, find the value of .

Answer and explanation

Correct answer: B. 6

  1. Step 1: Let the roots in AP be . Step 2. Sum of roots . Step 3. Product of roots . Sum of pairwise products . Step 4. Since , we have . Testing integer root : . For , : roots sum (), pairwise product , product . Fits perfectly! Answer: 6. Why not the others: Roots 1, 2, 3 are in AP with common difference 1 and sum to 6.

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