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- Question 23 and 24, Exercise 4.7
- 3 \times 2^{2}+4 \times 2^{3}+\ldots$$ It can be written as $$ 1\times 1+2 \times 2+3 \times 2^{2}+4 \time
- Question 27 and 28, Exercise 4.7
- }{3}+\frac{9}{9}+\frac{11}{27}+\ldots$$ It can be written as: $$ 5\times 1+7\times\frac{1}{3}+9\times\frac