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To determine the number of ways to elect 2 student council members from 7 candidates, you can use the combination formula ( C(n, k) = \frac{n!}{k!(n-k)!} ). Here, ( n = 7 ) and ( k = 2 ). So, ( C(7, 2) = \frac{7!}{2!(7-2)!} = \frac{7 \times 6}{2 \times 1} = 21 ). Thus, there are 21 different ways to elect 2 members.

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