Question

Find the unit's place digit in the expansion of : (i)84^561 (ii) 38^20

Answer 1

1. here in case of 84 
4x4=16
6x6=36
6x6=36 and the this will repeat afterwords

so the unit place digit will be 6

2. in case of 38
8x8=64
4x4=16
6x6=36
6x6=36 and the this will repeat afterwords

so here also the unit place digit will be 6.

Answer 2

Answer:

1. here in case of 84

4x4=16

6x6=36

6x6=36 and the this will repeat

afterwords

so the unit place digit will be 6

2. in case of 38

8x8=64

4x4=16

6x6=36

6x6=36 and the this will

repeat afterwords

so here also the unit place digit will be 6.