A contractor would like to build 9 houses, each with a different design. In how many ways can he put these houses on the street if 6 plots of land on one side of the street and 3 plots on the other side? *

College Algebra
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ISBN:9781938168383
Author:Jay Abramson
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Chapter9: Sequences, Probability And Counting Theory
Section9.5: Counting Principles
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A contractor would like to build 9 houses, each with a different design. In how many ways can he put these houses on the street if 6 plots of land on one side of the street and 3 plots on the other side? *

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A contractor would like to build 9 houses, each with a different design.

Assume,  first house is placed with 9 choices means he can place first house in any of the lot similarly placed second house with remaining 8 choices & then third house with remaining 7 choice & so on. 

Therefore , total number of ways for each house is : 

9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1 = 362880

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