If binary trees are represented in arrays, what formula can be used to locate a left child, if the node has an index i?

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Q. If binary trees are represented in arrays, what formula can be used to locate a left child, if the node has an index i?

(A) 2i+1
(B) 2i+2
(C) 2i
(D) 4i

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✅ Correct Answer: (A) 2i+1

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