JuniorTheoryCommon

What does the program print?

List<int> nums = [3, 8, 1, 6];
var result = nums.Where(n => n > 2).Select(n => n * 10);
Console.WriteLine(string.Join(" ", result));

30 80 60

Expecting 3 8 6: despite its name, Select does not pick items; it turns each one into the lambda's result, here n * 10.
Reading the chain in any order: Where runs first and filters the original numbers, and Select gets only those that passed.

JuniorTheoryCommon

List<int> nums = [3, 8, 1, 6];
var result = nums.Where(n => n > 2).Select(n => n * 10);
Console.WriteLine(string.Join(" ", result));

30 80 60

Expecting 3 8 6: despite its name, Select does not pick items; it turns each one into the lambda's result, here n * 10.
Reading the chain in any order: Where runs first and filters the original numbers, and Select gets only those that passed.