Question 1

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Question text

ExpC2P9

Calcule

sum subscript j equals 4 end subscript superscript 21 end superscript left square bracket fraction numerator left parenthesis 9 right parenthesis to the power of j end exponent plus left parenthesis negative 1 right parenthesis to the power of j end exponent over denominator left parenthesis 7 right parenthesis to the power of j end exponent end fraction right square bracket

 

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