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Six married couples are sitting together.NUmber of ways of selecting 4 people so that there is exactly one married couple among the four is: I thought the answer should be C(6,1)*C(10,1)*C(8,1) that is 480. The answer given i ...
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In a series of games between team A and team B,they decide to play on till a team wins 5 matches .In how many ways can A win the series if no match ends in a draw? Please explain how you solved it! Answer is 126 ...
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*Image* The figure shows mass m moves with velocity u. Ring is restricted to move on smooth fixed horizontal rod. Velocity of the ring at that moment? I thought the answer to be u/2 but the correct answer is 2u. This can happ ...
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If the equation y=1+x-2√x represents a parabola then coordinates of vertex are? Please explain how you solved it! Answer is (1/4,1/4) ...
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*Image* *Image* The figure shows mass m moves with velocity u. Ring is restricted to move on smooth fixed horizontal rod. Velocity of the ring at that moment? I thought the answer to be u/2 but the correct answer is 2u. This ...
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The oxoanions of which element(in its highest oxidation state) shows least tendency to polymerise? A)B B)Cl C)S D)P doubts : on what factors does tendency to polymerize depend on?? ...
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A point object moves on a circular path such that distance covered by it is given by S=t^2/2 +2t meter(t in seconds) .ratio of magnitude of acceleration at t=2 and t=5s is 1:2 .then radius of circle is? Ans 3√51 Please expl ...
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Q)In which of these compounds in there no hydrogen bonding? K2HPO4 K2HPO3 KH2PO3 CH3COOH What is the procedure for getting the answers? The structures of these compounds i have not come across in my study so is there any othe ...
