the rationalising factor of \frac { 1 } { \sqrt { 27 } - \sqrt { 18 } }
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For rationalising the denominetor of expression 1/√27-√18,the simplest rationalising factor is (a)√3-√2 (b)√27-√18 (c)√3+√2 (d)√18-√27The term independent of x in the expansion of `(1+x+2x^2)(3/2^2- 1/(3x))^9` is (A) `7/18` (B) `2/27` (C) `7/18+2/27` (D) `(7/18)-(2/27)`
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