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salatulmaghrib
So we see that the first term is 18 and the second is 16. It goes down by 2 each time. The 'zeroth' term is 2 more than the first one.
So, the nth term is (-2n+20).
Test:
When n=4
-2*4+20=12. This is right because the fourth number is 12, as we see.

The nth term of this number sequence 18, 16, 14, 12,... will be -2n + 20.

First term = 18

Second term = 16

Common difference = 16 - 18 = -2

It should be noted that the formula for finding the next term of an arithmetic sequence will be:

= a + (n - 1)d

= 18 + (n - 1) × -2

= 18 - 2n + 2

= -2n + 20

Therefore, the nth term of this number sequence 18, 16, 14, 12,... will be -2n + 20.

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