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Question
If a, b, c, d are in H.P, then ab + bc + cd is equal to
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Solution
The correct option is A 3 ad
Let 1, 1, 1, 1 are in HP
ab + bc + cd = 3
Option B and option C are not satisfying the condition.
Then, 2, 2, 2, 2 are in HP
ab + bc + cd = 12
Option D is not satisfying the condition.
So, correct option is A.
Let 1, 1, 1, 1 are in HP
ab + bc + cd = 3
Option B and option C are not satisfying the condition.
Then, 2, 2, 2, 2 are in HP
ab + bc + cd = 12
Option D is not satisfying the condition.
So, correct option is A.
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