How many different 4-digit numbers can be formed using only digits 1, 2, 3, and 4, given that they contain each of these digits
1 answer:
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Answer:
F# Code:
let rec prefix n list =
//Extracting head and tail elements
let valHead = (Listhead list)
let valTail = (Listtail list)
// Checking n value
match n with
| 0 -> []
| _ -> [valHead] at (prefix (n-1) valTail) // Creating list recursively
//Testing function
let lstT = [1; 2; 3; 4; 5]
printfn "%A" (prefix 3 lstT)
printfn "%A" (prefix 2 lstT)
printfn "%A" (prefix 4 lstT)
Step-by-step explanation: see attachment below for sample run
For this case we must find a fraction such that its result is given by a decimal of the form:
, that is, a repeated decimal.
Option A:
Option B:
Option C:
Option D:
So, the correct option is D
Answer:
Option D
Hope you can read my handwriting XD You can see the rest when you open the picture.
