2 → 6
3 → 12
4 → 20
5 → 30
6 → 42
9 → ?
Can you find a correspondence between these numbers?
It's not mine, so I don't take any credit. I've just seen it in Linkedin and wanted to share with the community.
Answer
90
Reasoning:
f(n) = n * (n+1)
Thus,
2 * 3 = 6,
3 * 4 = 12,
4 * 5 = 20,
5 * 6 = 30,
6 * 7 = 42,
9 * 10 = 90
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