Aptitude Day 12

Answers of Day 11:   1. 6

                                    2. 4

                                    3. 8

                                    4. 4

Rules for the number 9 

  

There is no cycle for 9 similar to 4.

If you get the power as an odd number, the answer will be 9. If it’s an even number, the answer is 81.

Example: Unit digit of the product of  9³¹ * 9¹¹ * 9¹⁹ * 9²⁰ =?

Solution:  31, 11, 19 are odd numbers and 20 is an even number so 9*9*9*1. The unit digit of this product is 9.

Problems to solve

1.    9⁷⁰ * 9⁷¹ * 9⁹³ =?

2.    9⁸⁰ * 9⁹⁰ * 9⁷⁴ * 9¹⁰¹ =?

3.    9²¹ * 9⁷⁹ * 9⁹⁷ * 9⁸⁸ * 9³³ =?

4.    9⁹⁸ * 9⁴³ * 9³¹ =?

Check out the answers over here Aptitude Day 13