Combinatorics

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Difference in Pascal's Triangle

COMBIN-NX5PRK

Which expression is equal to the difference:

$${19\choose 15} - {18\choose 15}?$$

A

${1\choose 0}$

B

${17\choose 15}$

C

${18\choose 14}$

D

${19\choose 14}$

E

none of the above