Which term of the A.P is 3,8,13,18,.....,78
Answers
Answered by
2
Answer:
a =3
d=5
an=78
Step-by-step explanation:
an =a+n-1*d
n:16
Answered by
2
Answer:
Given:-
a = 3
d = a2 - a1 = 8-3
= 5
Step-by-step explanation:
an = a + (n-1)5
78 = 3 + (n-1)5
78= 3+ 5n -5
78-3 = 5n -5
75 = 5n-5
75+5 = 5n
80/5 = n
n = 16
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