Resolved issue #3635 (#4807)

Co-authored-by: Vamsi Krishna Pasam <[email protected]>

program/program/find-sum-of-gp-series/FindSumOfGpSeries.fs

@@ -0,0 +1,39 @@
+open System
+
+let sumOfGP (a: float) (r: float) (n: int) : float =
+    if r = 1.0 then float n * a
+    else a * (pown r n - 1.0) / (r - 1.0)
+
+// Function to safely parse float values
+let tryParseFloat (str: string) : Option<float> =
+    match Double.TryParse(str) with
+    | (true, value) -> Some value
+    | _ -> None
+
+// Function to safely parse int values
+let tryParseInt (str: string) : Option<int> =
+    match Int32.TryParse(str) with
+    | (true, value) -> Some value
+    | _ -> None
+
+// Read inputs from user
+printfn "Enter the first term (a):"
+let a = 
+    match Console.ReadLine() |> tryParseFloat with
+    | Some value -> value
+    | None -> failwith "Invalid input for the first term"
+
+printfn "Enter the common ratio (r):"
+let r = 
+    match Console.ReadLine() |> tryParseFloat with
+    | Some value -> value
+    | None -> failwith "Invalid input for the common ratio"
+
+printfn "Enter the number of terms (n):"
+let n = 
+    match Console.ReadLine() |> tryParseInt with
+    | Some value -> value
+    | None -> failwith "Invalid input for the number of terms"
+
+// Calculate and print the sum
+printfn "Sum of GP series: %f" (sumOfGP a r n)