Answer :
Here, First term = a = - 40
Common difference = d = - 15 - (-40) = 25
To find = 15th term, ∴ n = 15
Using the formula for finding nth term of an A.P.,
an = a + (n - 1) × d
∴ an = - 40 + (15 - 1) × (25)
⇒ an = - 40 + 14 × (25) = - 40 + 350 = 310
∴ 15th term of the given AP is 310.
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