If d is an even integer and d/18 is an odd integer, which of the following is NOT an even integer?  Choose the correct choice from the following:
A) (d^2)/54
B) (d^2)/20
C) (d^2)/9
D) (d^2)/6
E) (d^2)/2
since d is an even integer and d/18 is an odd integer. thus maximum power of 2 in a is one. why ?? because if the power of 2 in the expression has been 2 or greater, then the d/18 must have been an even integer. (18=2*3^2. as 18 contain only one 2 in the expression)   now, any expression in which we have 4 at the denominator will be odd. out of the given options only 12 is a multiple of 4. hence answer should be (d^2)/20
<result>B</result>
If d is an even integer and d/18 is an odd integer, which of the following is NOT an even integer?