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प्रश्न
At the end of the 20th century, the world population was approximately 6.1 × 109 people. Express this population in usual form. How would you say this number in words?
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उत्तर
Given, at the end of the 20th century, the world population was 6.1 × 109 (approx).
People population in usual form = 6.1 × 109 = 6100000000.
Hence, population in usual form was six thousand one hundred million.
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While studying her family’s history. Shikha discovers records of ancestors 12 generations back. She wonders how many ancestors she has had in the past 12 generations. She starts to make a diagram to help her figure this out. The diagram soon becomes very complex.

- Make a table and a graph showing the number of ancestors in each of the 12 generations.
- Write an equation for the number of ancestors in a given generation n.
