AMC8 1987 Problem 9

Past Contests AMC8 AMC 8 - 1987
1

Wen finding the sum \dfrac{1}{2}+\dfrac{1}{3}+\dfrac{1}{4}+\dfrac{1}{5}+\dfrac{1}{6}+\dfrac{1}{7}, the least common denominator used is

Answer Choices
A. 120
B. 210
C. 420
D. 840
E. 5040