1.

If \[\overset{\to }{\mathop{a}}\,,\,\overset{\to }{\mathop{b}}\,,\,\overset{\to }{\mathop{c}}\,\] are three non-coplanar vectors, then the value of \[\frac{\overset{\to }{\mathop{a}}\,.(\overset{\to }{\mathop{b}}\,\times \overset{\to }{\mathop{c}}\,)}{(\overset{\to }{\mathop{c}}\,\times \overset{\to }{\mathop{a}}\,).\overset{\to }{\mathop{b}}\,}+\frac{\overset{\to }{\mathop{b}}\,.(\overset{\to }{\mathop{a}}\,\times \overset{\to }{\mathop{c}}\,)}{\overset{\to }{\mathop{c}}\,.(\overset{\to }{\mathop{a}}\,\times \overset{\to }{\mathop{b}}\,)}\] is:

A. 0
B. 2
C. 1
D. None of these
Answer» B. 2


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