Provide tight asymptotic bounds for the following six recurrences. a. T(n)= 2T(n/2)+n^4
b. T(n) = 16T(n/4) + n^2
c. T(n) = 2T(n/3) + T(n/4) + n
d. T(n) = T(n-1) + √ n
e. T(n) = 3T(n/2) + 5n
f. T(n) = T(√ n) + 7

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