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Maths CBSE Live product
Class 9 (2026-27)
Predicting What Comes Next: Exploring Sequences and Progressions
Arithmetic progression
4.
Assertion and reasoning
Question:
1
m.
Assertion (A):
The number
3
is a term in the triangular number sequence.
Reason (R):
The explicit formula for the
n
th
triangular number is
s
n
\(= \frac{n(n + 1)}{2}\), where \(n\) must be a positive integer.
Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are true but (R) is not the correct explanation of (A).
(A) is true but (R) is false.
(A) is false but (R) is true.
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