Question

find the number of arrangement of 5 things taken out of 12 things in which one particular thing must always be included​

Answer 1

Answer:

11C4×5!×12

because we can select 4 no.s out of 11 and 1 out of 12 and arrange in 5! ways

Answer 2

Answer:11c4 * 5!

Step-by-step explanation:We Must have to take one from the 12.

From The remaining 11 we have to take 4 so it will be 11c4 . We have the one thing which we took first then the arrangement between those 5 will be 5!