1.

Let a=alphahat(i)+2hat(j)-3hat(k), b=hat(i)+2alphahat(j)-2hat(k) and c=2hat(i)-alphahat(j)+hat(k). Then the value of 6alpha, such that {(atimesb)times(btimesc)}times(ctimesa)=a, is

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ANSWER :`(4)`


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