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Find the sum of the series 12-22+32-42+52-62+..........+992-1002 ...
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The first ionization potential of Na, Mg, Al, Si are in the order: ...
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{i^2} + {i^4} + {i^6} + ..... upto (2n+1) terms = ...
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A body of mass 10 kg is sliding on a frictionless surface with a velocity of 2,m{{s}^{-1}} . The force required to keep it moving with a same velocity is ...