Arithemetic Sequence

From :Mini MathCounts-Nov.2009

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The solution for 2-13-2011 Arithmetic Sequence

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Factorials and Trailing Zeros

Application problems

1,Find the number of trailing zeros in the expansion of 23! (4)

2, Find the number of trailing zeros in 101!(24)

3,Find the number of trailing zeros in the expansion of 1000!(249)

4, chapter-coundown-5-2007(2)

What is the hundred digit in the following product: 5x6x7x8x9x10?

5, chapter–coundown-37-2007(12)

Suppose that 50! Is written in the form N x10^x, where N is an integer. What is the largest possible value of x?

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