Multiple choice general knowledge math & puzzles

A business man earns 1 rupee on first day. His income on every subsequent day is double the income made on the previous day. His income on the 10th day is

  1. 512

  2. 1024

  3. 10

  4. 100
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is a geometric progression where $a=1$ and $r=2$. The income on day $n$ is $ar^{n-1}$. For the 10th day: $1 \times 2^{(10-1)} = 2^9 = 512$. Option 1024 is incorrect as it represents the 11th day ($2^{10}$).

Keep practicing — related questions