Question

The number of arrangements of 10 different things taken 4 at a time in which one particular thing allways occurs is​

Answer 1

Answer:

Total Permutations of n different things taken r at a time when a particular item is always included in the arrangement is :

r * (n-1 p r-1).  

so ,

4*(10–1 p 3)  

= 4* (9 p 3)

= 4*9*8*7

=2016.

                                            (or)

according to the photo

Answer 2

Answer:

according to the photo

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