Which of the following fractions can be written as the difference of reciprocals of two consecutive integers Choices:
A) 1/20 B) 7/30 C) 1/45 D) 13/56 E) 12/72
Difference of reciprocals means 1 has to be in the numerator;   So option BD can be ignored   For option A, BE, we require to search two consecutive numbers whose product is the denominator   20= 4 * 5 ......... 1/20nswer   1/20nswer = 1/20
<result>A</result>
Which of the following fractions can be written as the difference of reciprocals of two consecutive integers