You substitute the value of the position in the position to term rune.
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20th term = 20*(20+1)/2
The nth term is Un = a + (n-1)*d where a = U1 is the first term, and d is the common difference.
Say if you had the pattern 15 20 25 30 35 40 45 50 To find the nth term you have to see what the gap between the numbers is. In our case this is 5. Then you have to find out what the difference between the gap and the first number. In this sequence it is 10. So your answer would be..... 5n+10 That's how you find the nth term.
y11
Just plug in 30 for n in 3n-1. The answer is 89.