51. Which of the following function is similar to summarize?
52. The . . . . . . . . operator is used to connect multiple verb actions together into a pipeline.
53. What will be the output of the following R code?
> x <- as.Date("1970-01-01")
> x
> x <- as.Date("1970-01-01")
> x54. . . . . . . . . add new variables/columns or transform existing variables.
55. Connections to text files can be created with the . . . . . . . . function.
56. .rda extension used when saving data with function . . . . . . . .
57. What will be the output of the following R code?
> x <- matrix(1:4, 2, 2)
> y <- matrix(rep(10, 4), 2, 2)
> x * y
> x <- matrix(1:4, 2, 2)
> y <- matrix(rep(10, 4), 2, 2)
> x * y58. Which of the following R code creates a connection to 'foo.txt'?
59. The dplyr package can be installed from GitHub using the . . . . . . . . package.
60. Point out the wrong statement?
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