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Ahmed asked 28 friends if they had texted (T) or
emailed (E) that day. The number who had only
texted was the same as the number who had done
both. The number who had only emailed was two
less than the number who had done both. The
number who had neither texted nor emailed was
twice the number who had done both.
Work out P(E' U T).
Work out P(En T').



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