The alien alphabet consists of four letters. A word in the language is any sequence of four letters, with at least two letters being the same. How many words are there in the alien language? PLEASE HELP AND EXPLAIN

5/6

step-by-step explanation:

if i remember correctly with perpendicular stuff you just take away the negative

step-by-step explanation:

try remembering the steps

the correct option is 2.

step-by-step explanation:

according to the given information triangle abc is a right angle triangle with right angle at a. segment ab is 5 and segment ac is 7. point d is on segment bc and angles adb and adc are right angles.

it is given that triangles abd, cad, and cba are similar.

two triangles are similar if their corresponding sides are proportional.

in triangle cba, using pythagoras theorem

                      )

triangle abd and cba are similar,

                            (2)

triangle cad and cba are similar,

                      )

using (1), (2) and (3), we get

hence proved.

therefore option 2 is correct.