2,7,12,17,.........sum of the 12 terms of this A.P. is
Answers
Answered by
2
Answer:
a=2, a+d=7, a+2d=12......
⇒a+d=7
⇒2+d=7
⇒d=7−2=5
∴ t
n
=a+(n−1)d=2+(n−1)5
=2+5n−5
=5n−3
Similar questions