A) 473 & 382 | B) 629 & 728 |

C) 629 & 847 | D) 728 & 847 |

Explanation:

The given numbers are :

382 473 568 728 847 629

When changes are made as given in the question, numbers become as follows :

238 347 856 872 784 962

Again now, find out the difference between the numbers given in options as given below:

(1) 473 - 382 => 347 - 238 = 109

(2) 629 - 728 => 962 - 872 = 90

(3) 629 - 847 => 962 - 784 = 178

(4) 728 - 847 => 872 - 784 = 88

A) 567 | B) 284 |

C) 865 | D) 738 |

Explanation:

Here the given numbers are

567 284 696 865 738

When 1 is added to the last digit of each of the above numbers, it becomes as follows :

568 285 697 866 739

After reversing the order of digits , we get

865 582 796 668 937

Now , when the numbers are arranged in ascending order their order becomes as follows:

582 668 796 865 937

Hence , the fourth number is 865 (a number formed by 567). Therefore option(1) is correct answer.

A) 17 | B) 19 |

C) 15 | D) 21 |

Explanation:

Second, fourth and the sixth digits of the number are 3, 1 and 6. Using these digits only once we can make 361, which is a perfect square number. Hence, our answer is

A) 9 | B) 0 |

C) 6 | D) 3 |

Explanation:

There are 10 digits. Now, third digit from the right means (10-3+1 = ) 8th digit from the left. But, from the question , third and eighth digits are interchanged. Hence, the required digit is the third digit of the given number, ie 0.

A) None | B) One |

C) Two | D) Three |

Explanation:

**Given Number:** 4 2 1 5 7 9 3 6 8

**Ascending order: **1 2 3 4 5 6 7 8 9

Hence the required pairs are