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VARVARA [1.3K]
3 years ago
6

Use Pascal's triangle to find 6C3

Mathematics
2 answers:
katrin2010 [14]3 years ago
5 0
Ignore tht pascal triangle its way too inefficient
Formula nCr = n! /r! (n-r)!
So 6C3= 6!/3!(6-3)!=20
Lena [83]3 years ago
4 0

Using Pascal's triangle

Number of terms                                                    Expression

   1  =                                   1----------------------------(x+a)^0

   2 =                                1        1----------------------------(x+a)

  3 =                         1         2          1-----------(x+a)^2

 4=                     1         3            3         1----------(x+a)^3

 5=                 1          4         6         4        1----------(x+a)^4

6=          1           5            10        10         5       1----------(x+a)^5

7=       1             6            15          <u>20 </u>       15         6      1 ----------(x+a)^6

8=     1             7             21          35        35        21      7      1 ----------(x+a)^7

The meaning of _{3}^{6}\textrm{C} , is coefficient of fourth term of an expression having 7 terms.

Using pascal Triangle value  or coefficient of Fourth term of the expression

(x+a)^6=\\\\\text{will be}\\\\_{3}^{6}\textrm{C}=20

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