## Discussion Forum

Que. | The number of strings of length 4 that are generated by the regular expression (0|?) 1+2* (3|?), where | is an alternation character, {+, *} are quantification characters, and ? is the null string, is: |

a. | 8 |

b. | 10 |

c. | 11 |

d. | 12 |

Answer:12 |