Question

What is the last mean of an arithmetic series whose last term is b ?

Plz answer fast it’s for exam

Answer 1

Answer:

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General Form of AP a, a + d, a + 2d, a + 3d, . . .

The nth term of AP an = a + (n – 1) × d

Sum of n terms in AP S = n/2[2a + (n − 1) × d]

Sum of all terms in a finite AP with the last term as 'l' n/2(a + l)