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The date can be written as 3.14.15 which are the first digits of pi. That can only happen once every hundred years.
International pi day was chosen because it's on March 14 or 3/14 and the first three numbers of pi are 3.14 Larry Shaw, physicist, organized the first pi day in 1988 at the San Francisco Exploratorium. He thought that it would be fun to march around and eat fruit pies.
50 years is a golden wedding, 25 is a silver wedding? I know it says "gd" but I wonder...
[pi^(1/3)]^2 * pi = pi^(2/3) * pi = pi^(5/3) The answer is the cubic root of pi to the fifth power.
If the question refers to GDP(I), it is a measure of national output (Gross Domestic Product). There are basically three ways of measuring it - Output, Expenditure and Income - the last of which gives GDP(I). In theory, all three measures should agree but in practise they don't. If the question did not refer to GDP(I), then apologies.