Write an Arduino sketch to add up add the numbers in the given array and display the result on the Serial Monitor? const int len = 0; int a len] = 20, 4, 2, 12, 13, 1s; const int len = 6; int a[len] = {0, 4, 2, 12, 13, 1s; void setup (){

Sure, here's an example Arduino sketch that can add up the numbers in the given array and display the result on the Serial Monitor:

const int len = 6;
int a[len] = {20, 4, 2, 12, 13, 18};

void setup() {
  Serial.begin(9600);
}

void loop() {
  int sum = 0;
  
  // Add up the numbers in the array
  for (int i = 0; i < len; i++) {
    sum += a[i];
  }

  // Print the result on the Serial Monitor
  Serial.print("Sum of numbers in the array: ");
  Serial.println(sum);
  
  // Wait for 1 second before repeating
  delay(1000);
}

Note that I fixed a typo in the declaration of the `a` array. The `setup()` function initializes the Serial communication at a baud rate of 9600. In the `loop()` function, we use a for loop to iterate through the array and add up the numbers. We then print the result on the Serial Monitor using `Serial.print()` and `Serial.println()`. Finally, we add a delay of 1 second before repeating the process.