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For x = 5/7 , If tk is the first negati...

For `x = 5/7` , If `t_k` is the first negative term in the expansion of `(1+x)^(7//5) `, then ` t_1, + t_2, + …..t_k = `

A

`13/7`

B

`107/14`

C

`104/49`

D

`921/28`

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The correct Answer is:
C
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