The term trial refers to
a. doing an experiment once
b. something that will lead to an error
c. judging whether an experiment is good
d. trying a different procedure for your experiment

there is only one way to arrange all the eight relative to each other because they are not distinct. we have

now there are nine places to place an (and not more than one in one place).   because we have four symbols, we need to choose four of these nine places to insert an . order does not matter because the are not distinct.

thus there are 1 · c(9,4) ways, or, if we calculate it,

thus there are 126 ways to form such "words."

i will do it what is ur user and pass

step-by-step explanation: