The sum of n terms of the series 1 + (1+a) + (1+a+a^2) + (1+a+a^2+a^3) + , is

JEE Main Mathematics question

The sum of terms of the series , is

Answer: (A)

TOPIC NOT IN SYLLABUS: Principle of Mathematical Induction The -th term is , so . This equals

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Question ID VK-012980