The nth term of sequence is given by 5n2-2.find the 3 term of this sequence​

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1. Answer:

   68

   Step-by-step explanation:

   Given, Tn=5n2−2

   So, T1=5−2=3

   T2=5(22)−2=18

   T3=5(32)−2=47

   So, Sum of first three terms =3+18+47=68

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