Question

If A=1, D=3 and An=20 then N=______​

Answer 1

Answer:

n = 20

Step-by-step explanation:

because an = 20

in it a=1 so n=20

Answer 2

Answer:

6

Step-by-step explanation:

a+(n-1)D=20

1+(n-1)3=20

1 + 3n - 3 = 20

-2 + 3n = 20

3n = 20 - 2

3n = 18

n = 18/3

n = 6

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