Find n(A)for the set.
-$A = \left\{ \frac { 1 } { 2 } , - \frac { 1 } { 2 } , \frac { 2 } { 3 } , - \frac { 2 } { 3 } , \frac { 3 } { 4 } , - \frac { 3 } { 4 } , \ldots , \frac { 19 } { 20 } , - \frac { 19 } { 20 } \right\}$
A) $n ( A ) = 38$
B) $n ( A ) =$ Infinite
C) $n ( A ) = 40$
D) $n ( A ) = 19$

Question

Quizplus · Accepted Answer

The set A consists of pairs of positive and negative fractions starting from 1/2 to 19/20, making a total of 19 pairs. Since each pair has 2 elements (a positive and a negative fraction), the total number of elements in set A is $19 \times 2 = 38$.

Find N(A)for the Set A) n(A)=38n ( A ) = 38n(A)=38

Find N(A)for the Set A) $n ( A ) = 38$