find an ap whose 4th term is 9 and the sum of its 6th and 15th terms is 40
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t4=9
a+3d=9-----------------i
t6+t15=40
a+5d+a+14d=40
=2a+19d=40-----------ii
a+3d=9
2a+6d=18
2a+19d=40
__________
-13d=-22
d=-22/-13
=22/13
a+3d=9-----------------i
t6+t15=40
a+5d+a+14d=40
=2a+19d=40-----------ii
a+3d=9
2a+6d=18
2a+19d=40
__________
-13d=-22
d=-22/-13
=22/13
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