Sum of n terms of ap 5nsq.-3n .
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Putting n=1, 5n²-3n
=5-3=2
Putting n=2, 5n²-3n
=14
Therefore 2nd term is 14-2=12
Therefore AP is 2, 12, 22 ... and so on.
10th term=a+9d
=2+9*10
=2+90
=92
Answered by
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5n^-3n
n=1
5(1)^-3(1))
5-3
=2
n=2
5(2)^-3(2)
20-6
=14
n=3
5(3)^-3(3)
45-9
=36
2,14,36,,,,,
CD=14-2=12
a1,a2, a3....
2,12,24,36..... are in ap
n=1
5(1)^-3(1))
5-3
=2
n=2
5(2)^-3(2)
20-6
=14
n=3
5(3)^-3(3)
45-9
=36
2,14,36,,,,,
CD=14-2=12
a1,a2, a3....
2,12,24,36..... are in ap
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