DRDO Multi tasking staff Model paper 6

The given number is 22471
The unit digit of 2.
⇒21=2
⇒22=4
⇒23=8
⇒24=6
⇒25=2
Here, the digit is repeating after every 4th power.
Now, ⇒22471=22468×223=(224)117×223
The unit digit of expression (224)117×223
⇒(224)117×223=6×2×2×2=8
Hence, the unit digit of 22471= 8.