IIT-JEE Exam

Four persons independently solve a certain problem correctly with probabilities 1/2, 3/4 ,1/4,1/8. Then the probability that the problem is solved correctly by at least one of them is

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IIT-JEE Other Question

The area enclosed by the curves y = sinx + cosx and y = |cosx - sinx| over the interval [0,90 degree] is
For 3i^3 matrices M and N, which of the following statement(s) is (are) NOT correct ?
(A) NTMN is symmetric or skew symmetric, according as M is symmetric or skew symmetric
(B) MN, NM is skew symmetric for all symmetric matrices M and N
(C) MN is symmetric for all symmetric matrices M and N
(D) (adj M) (adj N) = adj(MN) for all invertible matrices M and N