Two friends were stuck in a cottage. They had nothing to do and thus they started playing cards. Suddenly the power went off and Friend 1 inverted the position of 15 cards in the normal deck of 52 cards and shuffled it. Now he asked Friend 2 to divide the cards into two piles (need not be equal) with equal number of cards facing up. The room was quite dark and Friend 2 could not see the cards. He thinks for a while and then divides the cards in two piles.
On checking, the count of cards facing up is same in both the piles. How could Friend 2 have done it ?
On her drawing table, Sayna lit 12 coloured candles. A few seconds later she blew two candles off.
How many candles Sayna have at the end?
You need to move three matchsticks to form three squares. Can you do it?
Can you count the number of triangles in the given picture?
