An arithmetic progression or arithmetic sequence is a sequence of numbers such that the difference between the consecutive terms is constant.

Formula:
The nth term of an arithmetic progression (A.P) can be expressed as:

a_n = a_1 + (n-1)d

Where,

a_n = nth term

a_1 = First term

d = Common difference

Given:

A.P = 2, 7, 12, 17, ….

Therefore,

a_1 = 2

d = 5

We are required to find the 18th term.

a_18 = 2 + (18-1)5

a_18 = 87

Hence, the 18th term of the given arithmetic sequence is 87.

Therefore, option A is correct.

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