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                                    Let set R={P:B⊆P⊆A}. If A={1, 2, 3, 4, 5} and B={1, 2}, then the number of elements in set R is | 
                            
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Answer»  Let set R={P:B⊆P⊆A}. If A={1, 2, 3, 4, 5} and B={1, 2}, then the number of elements in set R is  | 
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