Imagine a triangle of coins on a table so that the first row
has one coin in it and the second row
has two coins in it and so on. If you can only move one coin
at a time, how many moves does it take
to make the triangle point the other way?
Answers were Sorted based on User's Feedback
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
Is This Answer Correct ? | 1 Yes | 0 No |
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
Is This Answer Correct ? | 2 Yes | 2 No |
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, ...
Is This Answer Correct ? | 2 Yes | 4 No |
suppose you build a tower interlocking cubes that is 99 cubes high. And suppose you have to paint each square on the tower. How many squares would you have to paint?
Three members are hunting in a forest.While crossing a streem cartridges of two of them gets wetted up.Then the third person decides his cartidges equally. After 4 shots of each person, total cartridges remaining are equal to what each had initially after sharing.How many total cartridges they initially they shared?
arrange these alphabets evenymroin in to three words
There are 3 ants at 3 corners of a triangle, they randomly start moving towards another corner. What is the probability that they don't collide?
Mrs. F has invited several wives of delegates to the United Nations for an informal luncheon. She plans to seat her 9 guests ina row such that each lady will be able to converse with the person directly to her left and right. She has prepared the following list. Mrs. F speaks English only. Mrs. G speaks English and French. Mrs. H speaks English and Russian. Mrs. J speaks Russian only. Mrs. K speaks English only. Mrs. L speaks French only. Mrs. M speaks French and German. Mrs. N speaks English and German. Mrs. O speaks English only. How many distinct seating arrangements are possible? Give all possible seating arrangements. Note that ABCD and DCBA are the same.
A fly is flying between two trains, each travelling towards each other on the same track at 60 km/h. The fly reaches one engine, reverses itself immediately, and flies back to the other engine, repeating the process each time. The fly is flying at 90 km/h. If the fly flies 180 km before the trains meet, how far apart were the trains initially?
There are four friends, one weekend they plan to go to a picnic. Each family have husband and wife with two kids each, further each kid has 2 pets. Total how many went to the picnic?
If it is given that: 25 - 2 = 3 100 x 2 = 20 36 / 3 = 2 What is 144 - 3 = ?
what three specific job positions do you target from qatar airways group u.k?
In a sports contest there were m medals awarded on n successive days (n > 1). 1. On the first day 1 medal and 1/7 of the remaining m - 1 medals were awarded. 2. On the second day 2 medals and 1/7 of the now remaining medals was awarded; and so on. 3. On the nth and last day, the remaining n medals were awarded. How many days did the contest last, and how many medals were awarded altogether?
name the cities which consist of a fruit name in its starting?
P pages read in d mins after day p+1 pages read in d+1 mins last day 379 pages done in 317 mins find p+4