exam Maths Puzzle Numerical Ability

the first example in a lecture of series is a^n=1/2^n can you write the recursion formula for this series?

please help with this, thanks

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exam Other Question

a researcher orders a broth 40.2% glucose for her lab. However, she needs a stronger broth, one that is 50.1% glucose. She has 16.1 liters of 57% glucose broth in the stock room. How much 50.1% glucose broth can she make? how to simplify this eqaution?

(-7x3) (20x9)