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Combinatorics Difficulty 2.0 Junior Find the answer United Kingdom

Rohan wants to cut a piece of string into nine pieces of equal length. He marks his cutting points on the string. Jai wants to cut the same piece of string into only eight pieces of equal length. He marks his cutting points on the string. Yuvraj then cuts the string at all the cutting points that are marked. How many pieces of string does Yuvraj obtain?

(A) $15$ (B) $16$ (C) $17$ (D) $18$ (E) $19$

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