Which term of the AP: 3,8,13,1 8,......is 78?
Answers
Answer:
16th term
Step-by-step explanation For the following A.P : 3,8,13,18,------, 78
First term (t1) = a = 3,common difference (d) = 8 - 3 = 5 and last term (tn) = 78
The general term of A.P is
tn = a + (n - 1) d
78 = 3 + (n - 1)5
78 = 3 + 5n - 5
78 = - 2 + 5n
78 + 2 = 5n
80 = 5n
80/5 = n
16 = n
n= 16
16th term of A.P : 3,8,13,18,------is 78.
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Answer:
16th term
Step-by-step explanation:
nth term of an ap is =
here, a=3, d=5, nth term=78