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frac(1)( 1 xx 4 )+ frac(1)(4 xx 7 ) + fr...

`frac(1)( 1 xx 4 )+ frac(1)(4 xx 7 ) + frac(1) (7 xx 10) + frac(1)(10 xx 13 ) + frac(1) (13 xx 16) = ?`

A

B

B

A

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D

C

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