SEQUENCE | ANSWER | EXPLANATION |

+ + + * * * * + + + + * * * + + + + ? ? * | + * | The pattern for + is 3, 4, 5. The pattern for * is 4, 3, 2. |

O O X X X X O O X X X O O X X ? ? X | O O | The pattern for X is 4, 3, 2, 1. There are always two O symbols. |

+ + + & & & & & ; - - - & & & & ; x x x & & & ; ÷ ÷ ÷ & & ; ? | + + + & | The pattern is 3+ 5& ; 3- 4& ; 3x 3& ; 3÷ 2& ; and therefore what follows must be 3+ 1&. |

* * | o o o o | * * ? | o o ? | * * * * | o o | | * o | The pattern for * is 2, 3, 4. The pattern for o is 4, 3, 2. The vertical lines act as separators. |

# $ & # $ $ & # # $ ? & ? # $ $ $ & | $ # | With the & symbol acting as a separator, the $ and # symbols are increased alternately by one. |

# + + + - - - # + + - - - # + + - - # + - - # + - # ? ? | - # | With the # symbol acting as a separator, the + and - symbols are decreased alternately by one. |

> < = = + > ? ? = + | < = | The first five symbols > < = = + repeat as a set. |

6 9 + + 9 6 X X 6 9 + + 9 6 X X 6 9 + + ? 6 X ? | 9 X | The first eight symbols 6 9 + + 9 6 X X repeat as a set. |

$ # # % % % | # % % $ $ $ | ? | $ # # % % % | % $ $ # # # | With the | symbol acting as a separator, each set consists of six entries (one first entry, two second entries and three third entries).The first, second and third entries are $ # % in turns. |

> = = < < < < < = = > > > = = < < < = = ? > > > > = = ? = = | > < | The pattern for > is 1, 3, 5. The pattern for < is 5, 3, 1.There are = = to act as separators. |

@ < ^ > @ ? ^ > @ < ? ? @ < ^ > @ < ^ > @ | < ^ > | The first four symbols @ < ^ > repeat as a set. |

! ! o x ! ! ? x ! ! o x ! ! o ? ? | o x ! | The first four symbols ! ! o x repeat as a set. |

+ - - X + + + - - - - X + + + ? ? ? - - - - - X | + + - | The pattern for + is 1, 3, 5. The pattern for - is 2, 4, 6. The X symbols act as separators. |

|| || | X || || X || | X || X ? ? | | X | The X symbols act as separators. The number of vertical lines reduce by 1 in each set. |

O O O O + O O O - - O O + + + ? - - - - | O | The pattern for + is 1, 3. The pattern for - is 2, 4. The pattern for O is 4, 3, 2, 1. |

+ - X + + - X + + - - X + + - ? ? X | None of these | The pattern for (+ - X) triplet is (1, 1, 1), (2, 1, 1),(2, 2, 1), (2, 2, 2). So, the answer is - X. |