alleryTwo consecutive triangular numbers add up to a:
APrime number
BCube number
COdd number
DSquare number
Answer & Solution
Correct answer: D. Square number
1. Triangular numbers are 1, 3, 6, 10, 15.
2. 3 plus 6 is 9 and 6 plus 10 is 16.
3. The sum is always a square number.
_Source: syllabus Mathematics, Chapter 6, Squares and Square Roots._
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