School identification codes at Walla Walla High school contains 1 letter followed by 3 numbers. All codes are equally likely. Find the number of possible identification codes. Find the probability that an ID code of the school does not contain the number 0.

this is a very good question

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i got a hair cut today from my mom not to flex just to flex kim jon un is one rad fellow i'd say you'd need to take the hairline in kinda like a box shape like someone rammed a lego brick into your head. from there you really need to take the top up keeping with that boxy aesthetic, finally coat the whole thing with gel if your country economics are failing or whatever you can just coat it with the starving children's food rations. about 5 orphans per strand is a good ratio. good luck with the fresh cut my dude

in if you ask questions, the points are taken from your total and given to the one who answered it..

so if i have 30 points and i ask a question for 5 points, then when someone asks a question i will lose 5 points and the answerer earns 5

happy to

b. 2 and 4

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sounds & other waves originate from any vibrating object