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Let the number of members be n.
Then their serial numbers are: 1, 2, 3, ..., n.
Each member contributes 2 × their serial number,
So, total contribution is: 2(1 + 2 + 3 +…+ n)
We know that sum of n natural numbers = n (n + 1)/2
So, 2 x n(n + 1)/2 = 3042
n(n + 1) = 3042
by solving this equation, we get n = 54.665
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