1.Write a Java method that calculates the following sum: 1/2 + 1/4 + 1/6 + 1/8 + ... + 1/(2*N) With N a positive integer. Test the method in a Java program that prompts the user to enter N and displays the sum. Pay attention to the division of integers. In Java (1/2 equals 0) 2.Write a Java method that calculates the term n of the following series: U0=1 U1=2 Un= 4*Un-1+ 3*Un-2 Write a Java program that uses the method to calculate the n term of the series.