Question

Sum of 5th and 9th term is 30. If its 25 th term is three times its 8 th term then find a.p

Answer 1

a+4d+a+88=30
2a+12d=30
a+6d=15

according to the question
3a+21d=a+24d
2a=3d

a=3d/2

putting value of a in first equation

a+6d=15

3d/2+6d=153d+12d=15
15d=15
d=1

a=3d/2

a=3*1/2

a=1.5

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Answer 2

the A.P.:3,5,7,9,11,...(here a=3 and d =2)