Using the identity \[{{a}^{2}}-{{b}^{2}}=(a+b)\,(a-b),\]valuate\[24.7\times 25.3\].

Using the identity \[{{a}^{2}}-{{b}^{2}}=(a+b)\,(a-b),\]valuate\[24.7\

1.	Using the identity \[{{a}^{2}}-{{b}^{2}}=(a+b)\,(a-b),\]valuate\[24.7\times 25.3\].
A.	\[624.91\]
B.	\[642.91\]
C.	\[624.19\]
D.	\[642.19\]
Answer» B. \[642.91\]