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Arrange the following in descending order: a=√13 +√11, b=√15 + √9, c = √18 + √6 and d=√7 + √17

A.	abdc	B.	dcab
C.	adcb	D.	acdb

Answer and Explanation

Answer: abdc

Explanation:
Given a = √13 + √11, b = √15 + √9 , c = √18 + √6 and d = √7 + √17
In the given surds, the sum of the terms of each of the surds is the same at 24. Then the surd containing the terms as far as possible is the smallest
=> a > b > d > c

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