Question

A gardener planted the mangoes trees in a mathematical ordered way (i.e. he planted tree in rows).
He created total of 19 rows of trees.

Note: There should be more than 2 trees to count as a row.

What is the minimum number of trees required by the gardener to have 19 rows of trees ?

Answer 1

Minimum no. of trees in a row is 3 as because it should be more than 2 where 2 not included. No. of rows = 19. Thus, 19 * 3 = 57. SO, minimum no. of trees required are 57!!!

Answer 2

A B C 
E F G H
I J K L
M N O P
R S T
5 horizontal rows
4 vertical columns
4 diagonals with slope 1 (ROL, NKH, MJG, IFC)
4 diagonals with slope -1 (SNI, TOJE, PKFA, LGB)
2 knight's move diagonals with slope -2 (AJS, BKT)