by Let A₁, A₂, …, An, n arithmetic means are inserted between two numbers ‘a’ and ‘b’ such that a, A₁, A₂, …, An, b from an AP.
Here, total number of terms are (n + 2) and common difference be d
b = (n + 2)th term = a + (n + 2 – 1) d
d = (b – a)/ (n + 1)
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