Question

What is the last digit of the number 7¹⁹⁰?

(a) 7
(b) 9
(c) 3
(d) 1​

Answer 1

Step-by-step explanation:

Generalizing, number of the form and corresponding units digits can be written as under.

4n→1

4n+1→7

4n+2→9

4n+3→3

190 = 188 + 2 = 4*47 + 2

So, the last digit of the number 7¹⁹⁰ is 9.

Answer 2

7^19=11,398,895,185,373,143

so option c is correct

hope it helps you ✌️✅✅✅