C Sharp (C#) - LINQ Fundamentals
Which of the following is the correct way to group a list of integers by their value modulo 5 using LINQ in C#?
Which of the following is the correct way to group a list of integers by their value modulo 5 using LINQ in C#?
easy📝 Syntax Q3 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand grouping key
We want to group numbers by their remainder when divided by 5, which is done byn % 5.Step 2: Check syntax
The correct syntax isGroupBy(n => n % 5). Other options use division, multiplication, or addition which do not group by remainder.Final Answer:
var groups = numbers.GroupBy(n => n % 5); -> Option DQuick Check:
Grouping by modulo 5 means usingn % 5[OK]
Quick Trick: GroupBy key must be the grouping criterion [OK]
Common Mistakes:
MISTAKES- Using division instead of modulo for grouping
- Using arithmetic operations that don't produce grouping keys
- Confusing GroupBy syntax with Where or Select
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