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Sum of n terms =5n^2-3n.

Sum of two terms :14d:10, t2:12, t1:2.

Sum of 3 terms :36 t3:22

Sum of 4 terms : 68t4:32

series (AP) is, 2,12,22,32......

a10 =a+9d =2+9*10 =2+90 =92

ie, 10th term is 92.
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