In a shop, there were 4 dolls of different heights M, N, O and P. 'P' is neither as tall as 'M' nor as short as 'O'. 'N' is shorter than 'P' but taller than 'O'. If Anvi wants to purchase the tallest doll, which one should she purchase?

According to question,
'P' is neither as tall as 'M' nor as short as 'O'.
M > P > O .............................(1)
'N' is shorter than 'P' but taller than 'O'.
P > N > O...............................(2)
After comparing the equation (1) and (2),
we will get,
M > P > N > O
The correct order of dolls according to descending order of their heights are : M > P > N > O.
Therefore, Anvi will purchase the doll M.