Answer / sriram

HINT:-> first row in the triangle has one coin

o
HINT2:->second row has twpo coins.


o

o o


solution:


drop(move ) the coin horizontally below the second row
coins ,and the triangle becomes upside down!


o o

o

Answer / gandhi kumar

just three moves u see its sort of simple o o o o
o o o
0 0
0
is to be achieved
so 0
0 0
0 0 0
0 0 0 0

x1
here2 0 0 here3
0 0 0
x2 0 0 x3
here1

Answer / guest

For a triangle with two row it is one, for a triangle with
three rows it is two, for a triangle

with four rows it is three.

For a traingle with five rows is it four?

It takes 5 moves to make the triangle with 5 rows point the
other way.

0 = a coin that has not been moved.

X = the old position of the moved coin

8 = the new position of the moved coin.

________X

_______X X

____8 0 0 0 8

_____0 0 0 0

____X 0 0 0 X

_______8 8

________8

For traingle of any number of rows, the optimal number of
moves can be achieved by moving the

vertically symmetrical coins i.e. by moving same number of
coins from bottom left and right, and

remaining coins from the top.

For a triangle with an odd number of rows, the total moves
require are :

(N2/4) - (N-4) Where N = 4, 6, 8, 10, ...

For a triangle with even number of rows, the total moves
require are :

((N2-1)/4) - (N-4) Where N = 5, 7, 9, 11, ...

Answer / shiri

9moves

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