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13-07-2020
Mathematics

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If the common difference of an A.P is d, find a3 – a1

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jimrgrant1 jimrgrant1

13-07-2020

Answer:

2d

Step-by-step explanation:

The n th term of an AP is

[tex]a_{n}[/tex] = a₁ + (n - 1)d

where a₁ is the first term and d the common difference, thus

a₃ - a₁

= a₁ + 2d - a₁

= 2d

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