If $10^20 – 83$ is written as an integer in base 10 notation, what is the sum of digits in that integer?

Correct answer marked below

161

170

Correct

179

185

191

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What this question tests

Your grasp of exponent rules — multiplying and dividing powers, power-of-a-power, and negative/zero exponents.

Adding exponents when multiplying bases that have the same exponent, or confusing (x^a)^b with x^(a·b).

If 1020–8310^20 – 831020–83 is written as an integer in base 10 notation, what is the sum of digits in that integer?