Question

The first term of an AP is - 2 and the 11th term is 18. Find its 15th term.​

Answer 1

26 is the answer of the question

Answer 2

$tn = a + (n - 1)d \\ t11 = - 2 + 10d \\ 18 = - 2 + 10d \\ 20 = 10d \: \\ d = 2 \\ \\ t15 = - 2 + 14d = - 2 + 28 = 26$

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