B_{2}CD _____ BCD_{4} B_{5}CD BC_{6}D

a. |
B_{2}C_{2}D |

b. |
BC_{3}D |

c. |
B_{2}C_{3}D |

d. |
BCD_{7} |

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B_{2}CD _____ BCD_{4} B_{5}CD BC_{6}D

a. |
B_{2}C_{2}D |

b. |
BC_{3}D |

c. |
B_{2}C_{3}D |

d. |
BCD_{7} |

Test ID: 610

Source: 501 challenging logic & reasoning problems

b. Because the letters are the same, concentrate on the number series, which is a simple 2, 3, 4, 5, 6 series, and follows each letter in order.