Question

find nth term and 20th term of A. P. 1,5,9,13​

Answer 1

Answer:

a=1

d=4

$a_{20}$= a+19d

$a_{20}$=1+  76=77

$a_{n}$= a+ (n-1)d

   =  1+ (n-1)4

   =  1+ 4n-4

   =  4n-3

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Answer 2

Answer:

nth =4n-3

20th=77

Step-by-step explanation:

given

a=1

d=4

n1=n

n2=20

ap =a+(n-1)d

an=1+( n-1)4

an=1+4n-4

an=4n-3

a20=1+(20-1)4

a20=1+(19)4

a20=1+76

a20=77