the 10 th term and 18 th term an a.p are 25 and 41 respectively then find 38 th term
Answers
Answered by
1
Answer : 81
Step-by-step explanation:
a+(10-1)d = 25
=>a+9d = 25 ---->(i)
a+(18-1)d =41
=>a+17d = 41 ---->(ii)
Now, (ii) - (i)
a+17d-a-9d = 41-25
=>8d = 16
=>d = 2
Therefore, a = 25-9d = 25-9(2) = 25-18 = 7
=> a = 7
38th term = a+(38-1)d
=7 + 37(2)
=81
Answer = 81
Similar questions