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Given a list of integers var nums = new List<int> { 2, 4, 6, 8, 10 };, how can you find the sum of only the even numbers using aggregate functions?

hard🚀 Application Q9 of 15

C Sharp (C#) - LINQ Fundamentals

Given a list of integers var nums = new List<int> { 2, 4, 6, 8, 10 };, how can you find the sum of only the even numbers using aggregate functions?

Anums.Where(n => n % 2 == 0).Sum();

Bnums.Sum(n => n % 2 == 0);

Cnums.Count(n => n % 2 == 0);

Dnums.Average(n => n % 2 == 0);

Step-by-Step Solution

Solution:

Step 1: Filter even numbers
Use Where() to select numbers divisible by 2.
Step 2: Sum filtered numbers
Call Sum() on the filtered list to get total of even numbers.
Final Answer:
nums.Where(n => n % 2 == 0).Sum(); -> Option A
Quick Check:
Filter with Where(), then Sum() [OK]

Quick Trick: Use Where() to filter, then Sum() to add [OK]

Common Mistakes:

MISTAKES

Passing predicate directly to Sum()
Using Count() instead of Sum()
Using Average() incorrectly

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