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a ) Recursion. For the recurrence relation a k = 2 a k - 1 + k , k 2 , a 1 = 1

)

Recursion. For the recurrence relation

a_{k} = 2 a_{k - 1} + k, k 2, a_{1} = 1 .

Find

a_{2}

and

a_{25} .

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