Please solve this riddle
what is the another number in the below series?
38869 ---> 38867---> 38889 ---> 38881 ---> 38861 ---> ?????
options:-
1. 38875
2. 37786
3. 38867
4. 38877
if you found the answer, please explain it how!
Answers
The numbers in the first table are 6, 9 and 11. So the largest number of the row is 11 and we have to figure out how to generate this number 11 from the other two numbers i.e. 6 and 9. The difference between the two numbers is 3 and their sum is 15. There seems to be no way of getting 11. Let us see the column then.
In the column, the largest number is 27. We have to generate this number from 6, and 3. 27 can be written as 3×3×3 or 9×3. It is difficult to see a rule here. But we have another row too. In the second row, the largest number is 65. 65 can be written as 13×5. Do you see the rule now?
In the first column, the sum of 6 and 3 is 9. When we multiply this by 3 which is the difference between the first and the second number in the column, we get 27. In the second column, we see the same rule 9 + 4 = 13 × 5 = 65. Thus we have found the rule and will apply this to the third column to find the final result. The missing number therefore is 11 + 7 = 18 × 4 = 72. Thus the answer is D) 72.