An up quark has charge +2/3, a down quark has charge -1/3, and a strange quark hascharge -1/3. The Sigma0 particle is formed by a combination of two down quarks and onestrange quark. What is its charge?
a) -1
b) +1/3
c) 1
d) 0
e) -1/3
Ans: a) -1
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