Sum of 5th and 9th term is 30
its 25th term is three times the 8th term find Ap
Answers
Answered by
11
Step-by-step explanation:
HOPE IT IS USEFUL TO UHH
KEEP SMILING
Attachments:
Answered by
2
Answer:
Given T5 + T9 = 30
a + 4d + a +8d =30
=302a + 12d = 30
a + 6d = 15
a = − 6d + 15
now
t25 = 3t8
a + 24d = 3 ( a + 7d )
)24d − 21d = 3a − a
a3d = 2a
2a3d = 2 ( 6d − 15 )
)15d = 30
d = 2
a = 15 − 6 × 2
a = 3
Similar questions