IIT-JEE Exam

Let M and N be two 3 ´ 3 non-singular skew symmetric matrices such that MN = NM. If PT denotes the
transpose of P, then M2N2 (MTN)–1 (MN–1)T is equal to

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IIT-JEE Other Question

The vector(s) which is/are coplanar with vectors ˆi + ˆj+ 2kˆ and ˆi + 2ˆj+ kˆ , and perpendicular to the vector
ˆi + ˆj+ kˆ is/are If the point P(a, b, c), with reference to (E), lies on the plane 2x + y + z = 1, then the value of 7a + b + c is
(A) 0 (B) 12
(C) 7 (D) 6