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A result of global warming is that the ice of some glaciers is melting . 13 years after the ice disappears, tiny plants, called lichens, start to grow on the rocks. Each lichen grows approximately in the shape of a circle. The relationship between the diameter of this circle and the age of the lichen can be approximated with the formula: d=18*(t-13)for t>13, where d represents the diameter of the lichen in millimeters, and t represents the number of years after the ice has disappeared. Using the above formula calculate the diameter of the lichen , 39 years after the ice has disappeared.
702
468
13
689

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TCS Other Question
A man has some socks in his drawer: 14 identical blue, 20 identical red, and 28 identical black. The lights are out and it is totally dark. How many socks must he take out to make sure he has a pair of each colour?
34
50
30
28 Alice and bob play the following coins-on-a-track game. 50 coins are stacked one above the other. One of them is a special (gold) coin and the reset are ordinary coins. The goal is to bring the gold coin to the top by repeatedly moving the topmost coin to another position in the stack. Alice starts and the players take turns. A turn consists of moving the coin on the top to a position I below the top coin (for some I between 0 and 50). We will call this an i-move (thus a 0-move implies doing nothing). The proviso is that an i-move cannot be repeated; for example once a player makes a 2-moves on subsequent turns neither player can make a 2-move. If the gold coin happens to be on top when it’s a players turn ther the player wins the game. Initially the gold coin is the third coin from the top then
In order to win, Alice’s first move should be a 1-move.
In order to win, Alice’s first move can be a 0-move or a 1-move.
Alice has no winning strategy.
In order to win Alice’s first move should be a 0-move.