Question

1. What is the unit digit of (13)21.​

Answer 1

Answer:

1 is the unit digit of 21.

Answer 2

Answer:

Units digit of Large Numbers – number raised to power

Identify the units digit in the base 'x' and call it say 'l'. {For example, If x = 24, then the units digit in 24 is 4. Hence l = 4.}

Divide the exponent 'y' by 4. If the exponent y is exactly divisible by 4. i.e, y leaves a remainder 0 when divided by 4. Then,

Explanation:

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