Problems based on Numbers Test 3

Question : 36 of 40

Marks: +1, -0

The last digit of

3^40

is:

Solution:

Power

3^1=3

3^2=9

3^3=7

3^4=1

3^5=3

The unit digit repeats itself after four powers
So,

3^{40/4}

3^0=1 .

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