Question

find the unit place of 2 to the power 90 *3 to the power of 45​

Answer 1

Answer: 6

Step-by-step explanation:

2^10 = 1024 unit no. 4

2^20 = unit no. 4^2 = 6

2^40 = unit nmbr 6 = 6

2^80 = unit nmvr 6

2^90 = 2^80 × 2^10

Unit nmbr 4*6 = 4

Now, 3^5= 243 unit nmvr 3

3^45 = (3^5* 3^5 * 3^5)^3

Unit = (3*3*3)^3

=7*7*7

=9

Multiply both = 4*9

Unit nmbr = 6