Доказать что n в 3 степени минус n, n€N, ділиться на 6

поставить предложения в данные времена:

 The world is awash with oil, yet it is also on the brink of a shortage - поставить в The Present Indefinite Tense 

That paradoxical state of affairs will keep traders guessing and prices volatile- поставить в The Present Continuous Tense,

 Price gyrations should help to banish the increasingly popular view that this year's oil shock is over, even if the Gulf menace is not. Which is line, because such complacency dangerous. -поставить в The Past Indefinite Tense,

The chart shows that, in any normal year, the time has come to draw down the stocks which were built up over the spring and summer - поставить в ThePastContinuousTense,

Which is line, because such complacency dangerous -поставить в TheFutureIndefiniteTense,

OPEC is producing almost as much oil as it did before the embargo was en¬forced. Meanwhile, demand has fallen faster than expected -поставить в TheFutureContinuousTenseActive