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12. Using nested loop, write C++ code that will print following patterne (20 pts) 13. Binary numbers are inconvenient because they're too long and not easy to read, Write C+ code that convers four bits binary number to decimal number (20 pts) Binary Decimal 1111 15 1110 1203 13 1100 12 1011 11 1020 10 1001 9 1000 0111 2 0110 6 0103 0100 4 0011 9 G010 2 0002 0000 0 14. Write a C++ code to find the approximate value of the following series for first 50 terms and find the final results. (use while or for loop) (20 pts) 1 1 1 Total 1 3