What is true about the sequence of triangular numbers?: 1, 3, 6, 10, ...

Each term is the sum of the previous two terms

Each term is the sum of consecutive natural numbers

Each term is the first odd number

Each term is a square number

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Q2.

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Q3.

Which of these describes the sequence: 1, 3, 5, 7, 9, ...?

Q4.

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