show that 7^(-20)-7^(-21)=6/7^41
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7^-20-7^-21
=1/7^20-1/7^21
=1/7^20(1-1/7)
=1/7^20(41/7)
=41/7^21
so, I think the question is wrong
=1/7^20-1/7^21
=1/7^20(1-1/7)
=1/7^20(41/7)
=41/7^21
so, I think the question is wrong
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