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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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in Data Structures & Algorithms I by (111k points)
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

Question is taken from Binary Trees topic in division Binary Trees of Data Structures & Algorithms I

I got this question during an internship interview.

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The correct option is (a) 2i+1

Easiest explanation - If binary trees are represented in arrays, left children are located at indices 2i+1 and right children at 2i+2.

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