Question

Find a3 if an=2n2+1. . ​

Answer 1

Step-by-step explanation:

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Answer 2

Correct Question :-

If aₙ = 2n² + 1, then find a₃.

Solution :-

In an Arithmetic Progression, the formula for calculating nth term is given as:

aₙ = a + (n - 1)d

where:

• a is the first term
• n is the number of terms
• d is the common difference

In this Question,

aₙ is defined as 2n² + 1

For finding the third term,

Substitute n as 3

⇒ a₃ = 2(3)² + 1

⇒ a₃ = 18 + 1

⇒ a₃ = 19

∴ Third term = a₃ = 19