Question

what is the unit digit in (277)^105-(94)^19

Answer 1

Answer:

7-4=3

Step-by-step explanation:

277×277 = unit place 9

Now consider only unit place

power - UNIT PLACE

1 - 7

2 - 9

3 - 3

4 - 1

so after every multiple of power 4 unit place will be 7

so 105= 4×26 +1

so unit place will be 7

similarly for 94