## Discussion Forum

Que. | Stack A has the entries a,b,c(with a on top). Stack B is empty.An entry popped out of stack A can be printed immediately or pushed to stack B.An entry popped out of the stack B can only be printed. In this arrangement, which of the following permutations of a,b,c are not possible? |

a. | b c a |

b. | b a c |

c. | c b a |

d. | c a b |

Answer:c a b |