A) 6 | B) 8 |

C) 4 | D) 9 |

Explanation:

N = H.C.F. of (4665 - 1305), (6905 - 4665) and (6905 - 1305)

= H.C.F. of 3360, 2240 and 5600 = 1120.

Sum of digits in N = ( 1 + 1 + 2 + 0 ) = 4

A) 4, 4 | B) 6, 2 |

C) 3, 2 | D) 2, 5 |

Explanation:

Given series is 372, 823, 644, 582, 46?, 8?7

Here the series follow the rule that :

372 = 3+7+2 = 12

823 = 8+2+3 = 13

644 = 6+4+4 = 14

582 = 5+8+2 = 15

46? = 4+6+? = 16 => ? = 6

8?7 = 8+?+7 = 17 => ? = 2

So the missing numbers are 6 and 2

A) 5040 | B) 2525 |

C) 2052 | D) 4521 |

Explanation:

The Word LOGARITHMS contains 10 letters.

To find how many 4 letter words we can form from that = 10p4 =10x9x8x7 = 5040.

A) S | B) I |

C) J | D) T |

Explanation:

Here the series has mixed two series.

n m l k...! reverse alphabet

o p q r ...! forward alphabet

So the letter before k is j and after that letter after r is s and so on...

A) Only a follows | B) Only b follows |

C) Both a & b follows | D) Neither a nor b follows |

Explanation:

Clearly, the situation demands making the education system more flexible and changing it periodically according to the needs of the time. So, both the courses follow.