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If x belongs to R, the numbers 5 1+x + 5 1-x , a/2 , 25 x +25 -x forms an A.P then a must lie in the interval A) [1,5] B) [2,5] C) [5,12] D) [12,infinity]

If x belongs to R, the numbers 51+x + 51-x , a/2 , 25x+25-x  forms an A.P then a must lie in the interval



A)     [1,5]



B)      [2,5]



C)      [5,12]



D)     [12,infinity]
 

Grade:11

1 Answers

Sourabh Singh IIT Patna
askIITians Faculty 2104 Points
7 years ago
Hii


Check in by applying the basic property of AP i.e.

2*(Middle Term) = SUm of first and Last term

you will get the relation in terms of “x”

do a bit of modification and the answer is ready


Thanks

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