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Operations on Whole Numbers — Maths STD 6 — Question

Maharashtra BoardEnglish MediumSTD 6MathsOperations on Whole Numbers1 Mark
Question
Without drawing a diagram, find.
6th triangular number.
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Answer

A triangular number can easily be remembered by the following rule
$N ^{\text {th }}$ triangular number,
$=n \times(n+1) 2$
Therefore, $6^{\text {th }}$ triangular number,
$=6 \times(6+1) 2=21$

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