Question

Can some one help me with this??? Really need help

Answer 1

$1-\frac{1}{3}-\frac{3}{7}=\\ \frac{21}{21}-\frac{7}{21}-\frac{9}{21}=\\ \frac{5}{21}$

Answer 2

Let the complete circle be signified as = 1
Shaded region will be equal to = total - 2 unshared part
= 1 - 1/3 - 3/7
taking LCM
= (21 - 7 - 9)/21
= 5/21