Q1:

Let a <- c(2, 3, 6, 7) and b <- c(-3, -12, 3.5, 7) be two numeric vectors. Then the length of the vector d <- c(a, b, 8) is equal to?

Q2:

If TT = (TRUE, TRUE), TF = (TRUE, FALSE) are two logical vectors than

TT & TF 

gives the result of