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Apparently power generation produces twice as much heat as electricity. How can this be quantified? What is the probability of the arrow stopping on X on the first spin and F on the second? Tom are four times the age of his son. After 6 years, the sum of their ages is 52 years. Find the present age of his son? Solve this integral? The length of the minor arc AB of a circle, centre 'O', is 2π cm and the length of major arc is 22π cm.?