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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

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