By applying the ‘Hit and trial’ approach we get to understand that the required value of ‘?’ is equal to the sum of the respective numeric values of positions of the given letters in English alphabet.
Multiplication series: In this series, each number is multiple with a series of logical numbers. In this series, the multiplication series is ×1.5, ×2, ×2.5, ×3, ×3.5, ×4 …….
Clearly, alternatively we add and subtract 10% of a term to obtain the next term of the series.
Thus, 10000 + (10% of 10000)= 11000;
11000 – (10% of 11000) = 9900;
9900 + (10% of 9900) = 10890;
10890 – (10% of 10890) = 9801.
9801 + (10% of 9801) = 9801+980 = 10781.
So, missing term = 10890- (10% of 10890)= 9801.
There are three alternative series 2, 3, 4 �� (consecutive numbers), 9, 8, 7 �. (consecutive number in descending order), and 23, 25, 27, � Hence, 7 will come in place of the missing number.
