Tuesday, January 29, 2008

nested subtraction

1-(1/2 - 2/3)=

A. 6/5
B. 7/6
C. 6/7
D. 5/6
E. 0

1 comment:

Luís Botelho Ribeiro said...

(1/2 - 2/3) equals (1x3 - 2x2)/(2x3) or -1/6.

We now calculate 1-(-1/6)=1+1/6=7/6. So the correct option is B.