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Grade: 12
        

let the positive no. a,b,c,d be in A.P. Then abc,bcd,cda,dab are


A) NOT in AP/GP/HP


B) in AP


C) in GP


D) in HP

10 years ago

Answers : (1)

askIITiansexpert nagesh
16 Points
							

Dear Raman Malik,

a,b,c,d are positive numbers in A.P.

Note: If a=b=c=d, then the answer will be AP,GP and HP i.e., option B,C,D should be correct. But in general, we consider that they are distinct.

we have to check whether abc,bcd,cda,dab follows AP/GP/HP.

i.e., we have to check whether abcd/d, abcd/a, abcd/b, abcd/c follows AP/GP/HP. 

i.e., we have to check whether 1/d, 1/a, 1/b, 1/c follows AP/GP/HP. 

As a,b,c,d are in AP, they will be either strictly increasing or decreasing.

Hence, 1/a, 1/b, 1/c, 1/d are also either strictly increasing or strictly decreasing sequence.

=> 1/d, 1/a, 1/b, 1/c is not either strictly increasing or strictly decreasing.

=> 1/d, 1/a, 1/b, 1/c  is not in AP/GP/HP.

Hence, option A is the correct option.

 

Please feel free to post as many doubts on our discussion forum as you can. If you find any question

Difficult to understand - post it here and we will get you the answer and detailed solution very quickly. We

are all IITians and here to help you in your IIT JEE preparation. All the best Raman Malik.

Regards,

Askiitians Experts

Nagesh.

 

 

 

10 years ago
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