Question

This year, 40 students have each travelled by one or more of plane (P), train (T) or boat (B). 7 have travelled only by plane. 11 have travelled only by train. 9 have travelled only by boat. n( ) P T + = 8 n( ) B+T = 3 n( ) B P+ = 6

Answer 1

Answer:

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Answer 2

Answer:

n(p)=7

n(t)=11

n(b) =9

p and t =6

b and t = 1

band p= 4

p b and t= 2