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150 grade twelve students were asked which of the following 3 TV programs they watch regularly. 102 watched Friends, 70 watched Survivor and 40 watched

150 grade twelve students were asked which of the following 3 TV programs they watch regularly. 102 watched "Friends", 70 watched "Survivor" and 40 watched "Crocodile Hunter". 25 watched both "Friends" and "Survivor", 27 watched "Friends" and "Crocodile Hunter", and 30 watched "Survivor" and "Crocodile Hunter". Determine the number of students who watched all three programs.

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