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Sequences and Series (001)If the first,fifth and tenth terms
题目内容：
Sequences and Series (001)
If the first,fifth and tenth terms of an arithmetic progression are in geometric progression and the sum of the second and eighth terms is 20,find the first term and the (non-zero) common difference.
Sequences and Series (001)
If the first,fifth and tenth terms of an arithmetic progression are in geometric progression and the sum of the second and eighth terms is 20,find the first term and the (non-zero) common difference.
If the first,fifth and tenth terms of an arithmetic progression are in geometric progression and the sum of the second and eighth terms is 20,find the first term and the (non-zero) common difference.
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