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Which one of the following is the correct formulae to find the parent node at index I?

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Which one of the following is the correct formulae to find the parent node at index I?

(a) (I-1)/K

(b) (I+1)/K

(c) (I*1)/K

(d) (I-2)/K
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The correct option is (a) (I-1)/K

To explain: The parent node for the node of index I in a K-ary tree is given by (I-1)/K.
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