If overline(a)=hat(i)+5hat(k), overline(...

If `overline(a)=hat(i)+5hat(k), overline(b)=2hat(i)+3hat(k), overline(c)=4hat(i)-hat(j)+2hat(k), overline(d)=hat(i)-hat(j)`, then `(overline(c)-overline(a)))*(overline(b)timesoverline(d))=`

`15`

`6`

`0`

`12`

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