Question
यदि $a = i + j + k,\,\,b = i + j,\,\,c = i$ तथा $(a \times b) \times c = \lambda \,a + \mu \,b$, तब $\lambda + \mu = $
दिया है; $(a \times b) \times c = (c\,.\,a)b - (c\,.\,b)\,a = \mu \,b + \lambda a$
जहाँ $\mu = c\,.\,a = 1,\,\,\lambda = - \,(c\,.\,b) = - \,1$
$ \Rightarrow \,\,\mu + \lambda = 1 - 1 = 0$.
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