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Mental Maths Deathless

Simple mental maths. Can't go wrong.
Quiz by
jazava
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Last updated: September 16, 2025
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First submittedSeptember 16, 2025
Times taken45
Average score57.1%
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Hint
Answer
xy = 35, x + y = 12. (x & y are positive integers) what could be x?
5, 7
cube root of 343
7
9th triangular number
45
6!
720
Hint
Answer
7th triangular number
28
55 is the nth triangular number. n = ?
10
x is a perfect square and perfect cube 100<x<1000. x = ?
729
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