sum of n terms of an A.P are given 5n2-3n. find the A. P and it's 20th term
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Answered by
5
Answer:
Step-by-step explanation:
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.
20th term=a+19d
=2+19*10
=2+190
=192
Answered by
0
Step-by-step explanation:
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.
20th term=a+19d
=2+19*10
=2+190
=192
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