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Get access to the detailed solutions to the previous year's questions asked in XAT exam.
The stack of apples can be imagined as shown below. For every row, there is an increase of 1 apple from the previous row.
This means that the sum total of the apples present in the stack will be sum of AP given as : 1,2,3,4.... ie the sum of numbers from 1.
From the table we can see that when the customer saw 126 apples, the apples in the top 4 rows had been sold.
Therefore, the number of rows = 16 - 4 = 12 rows.