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Computer Computer Difficulty: Medium

What is the purpose of the File.exist? method in Ruby? How many swaps are required for reversing an array having n elements where n is an even number? What will be the output of the following Python code? >>> a=[(2,4),(1,2),(3,9)] >>> a.sort() >>> a Which distributed computing framework is commonly used for batch processing of large datasets and is often associated with Hadoop? What will be the output of the following C code? #include <stdio.h> int main() { int a[4] = {1, 2, 3, 4}; int *ptr = &a[2]; float n = 1; ptr = ptr + n; printf("%d\n", *ptr); }