Let a, b, c be in AP and k 0 be a real number. Which of the following are correct? 1. ka, kb, kc are in AP 2. k-a, k-b, k-c are in AP 3. a k , b k , c k are in AP Select the correct answer using the code given below :

NDA 2019 Mathematics question

Let a, b, c be in AP and be a real number. Which of the following are correct? 1. ka, kb, kc are in AP 2. , , are in AP 3. , , are in AP Select the correct answer using the code given below :

(A)1 and 2 only
(B)2 and 3 only
(C)1 and 3 only
(D)1, 2 and 3Correct

Answer: (D)

Solution

With : multiplying by gives (1 correct); (2 correct); dividing by gives $ =

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Question ID VK-029082