Question

3^40 + 3^39 / 3^41 - 3^40
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Answer 1

now in numerator taking 3^39 as common and in denominator taking 3^40 as common

x = 3^39(3+1)/3^40(3-1)

now cancelling 3^39

x = 3+1/3(3-1)

x= 4/3(2)

x = 2/3