if the sum of the first n terms of an ap is 5n - n2, what is the first term ? what is the sum of first two terms ? what is the second term ? similarly find the 10th term.
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Answer:first term :3
Sum of first two terms:6
Second term:3
Step-by-step explanation:sn=5n-n2
1st term=5×1-1×2=5-2=3
Sum of first two terms =5×2-2×2=10-4=6
2nd term =6-3=3
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