Question 1

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ER_A1_C2_03_F

Sea text a end text subscript k end subscript una sucesión de números reales dada por:

text a end text subscript k end subscript equals left parenthesis negative 1 right parenthesis to the power of k plus 1 end exponent plus k comma space space space space space space space k space element of straight natural numbers

Determine text a end text subscript b end subscript times text a end text subscript c end subscript times text a end text subscript d end subscript

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