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Harmonic Progression

In an A.P., i...

Question

In an A.P., if S_n_–3 = 5n² – 28n + 39, then its 9^th term is

एक स.श्रे. में, यदि S_n_–3 = 5n² – 28n + 39, तब इसका 9^th पद है

A

77

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B

78

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C

87

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D

97

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Solution

The correct option is C 87
Solution

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