using the examples below answer these questions. use exact examples and format to answer

$1.$ Given a $7-$element array, say $\{$x$1,$ x$2,$ x$3,$ x$4,$ x$5,$ x$6,$ x$7\},$ how many comparisons do you need to sort the array by the mergesort for the best case?

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$2.$ Given a $7-$element array, say $\{$x$1,$ x$2,$ x$3,$ x$4,$ x$5,$ x$6,$ x$7\},$ how many comparisons doyou need to sort the array by the mergesort for the worst case?

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