Learning Task 4: 1) Sum of all prime numbers which is less than 20. 2) Sum of all prime numbers between 50 to 70. 3) Sum of all the prime numbers that is greater than 70 but less than 80. 4) Product of prime numbers from 80 to 90. 5) What is the sum of x + y + z, is 13, x, 19, y, 29, z is ascending order of prime numbers.
