Each part: 1.5 Marks
(i) Multiplication of even no. of negative integers gives a positive integer whereas multiple of odd no. of negative integers gives a negative integer.
(a) We have multiplication of three negative integers. So, the product will be negative integers. 
$(-2)\times (-3)\times (-4)=6\times (-4)=(-24)$
(b) We have multiplication of two negative integers and one positive integer. So, the product will be positive integers. 
$2\times (-3)\times (-4)=12\times 2=24$
(c) $\frac{2}{6}\times (-3)\times \frac{4}{10}$
 $=\frac{1}{3}\times -3\times \frac{2}{5}$
$=\frac{-2}{5}$
(ii)  (a) $-12<-4$
(b) $-15<-2$
(c) $-7>-29$