The sequence $$a_1$$,$$a_2$$......$$a_n$$, such that $$a_1=3$$,$$a_2 = 5$$,$$a_3 = a_1 +a_2$$,$$a_4 = a_1+a_2+a_3$$,$$a_n=a_1+a_2+$$...+$$a_{n-1}$$. What is the ratio of $$a_{24}$$ to $$a_{20}$$?
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A$$2^0$$
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B$$2^1$$
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C$$2^2$$
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D$$2^3$$
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E$$2^4$$
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正确答案: E