Question

which term of the Ap 5, 9 ,13.....81 ?​

Answer 1

Answer:

85 is the answer

logic - plus 4 in each number

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Answer 2

Answer:

20th term

Step-by-step explanation:

a=5

d= a2-a1= 9-5 = 4

an = a+(n-1) d

so a81 = a+(n-1) 4

81= 5+4n-4

81= 4n+1

80 = 4n

80/4 = n

so n=20

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