question_answer

 The value of \[\left( 5\,{{a}^{6}} \right)\times \left( -10\,a{{b}^{2}} \right)\times \left( 2.1\,{{a}^{2}}\,{{b}^{3}} \right)\] for \[a=1\] & \[b=\frac{1}{2}\] is:

A)  \[-\frac{105}{32}\]       

B)  \[\frac{100}{3}\]

C)  \[\frac{15}{101}\]                                

D)  0

E)  None of these