Question
Each member of a picnic party contributed twice to their
serial number. The total collection was Rs 3042. The (approximate) number of members present in the party wasSolution
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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