The sum of 5th and 9th term of an ap is 30 . If 25th term is 3 times of its 8th term .Find the ap
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Let the first term =a
common difference =d
A. T. Q
a+(5-1)*d+a+(9-1)*d=30
a+4d+a+8d=30
2a+12d=30 equ(I)
AGAIN
a+(25-1)*d=3*(a+(8-1)*d)
a+24d=3*(a+7d)
a+24d=3a+21d
2a-3d=0 equ(ii)
On solving the equ
a=3
d=2
A. P. = 3, 5, 7, 9
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