Question

Using Dr-Racket, what is the purpose of the number function?
(define (number n)
(local [(define (abstract int)
(* int 11))] (build-list n abstract)))

A) Create a list of the first n multiples of 11 starting at 11.

B) Create a list of the first n multiples of 11 starting at 0.

C) Create a list of the first n multiples of 11 starting at 1.

D) Create a list of the first 11 multiples of n starting at 1.

E) Create a list of the first 11 multiples of n starting at 0.

F) Create a list of the first 11 multiples of n starting at n.

Answer 1

SOLUTION

The given code makes a function named number that takes an arguement "n".

And it prepares a list of "n" multiples of 11 starting from 0.

Let me explain the underlying concept .

Inside the function it is creating an abstract function that takes an integer and then the expression (* int 11) is responsible for multiplication .Then the next expression calls the abstract function passing "n" as arguement.

PROOF:

SO the correct option is B