[R] a quick question about "rbinom"

[lynn.tsai]

Hello, I have the following code using rbinom, but I don't understand what
*"+1"* means in the code. Could someone help? Thanks so much,

> X1<-c("A","B")[rbinom(n,1,0.6)+1]
> X2<-c("C","D")[rbinom(n,1,0.1)+1]

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