1) How many ways can 4 lemon trees, 5 orange trees and 2 grapefruit trees be arr

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1) How many ways can 4 lemon trees, 5 orange trees and 2 grapefruit trees be arranged if no two lemon trees can be next to each other? 2) In how many ways can three A's, two B's, and five C's be arranged in a string so that the string so that the string does not begin with an A? 3)In a class of 40 students, there are 15 females students and 20 juniors. There are 8 students which are neither female nor a junior. a) How many students are both female and a junior? b) How many students are female but not a junior? c) How many students are male and a junior?

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