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| 1. |
If Sn=2n2+2n+1 then find a10 |
| Answer» S1=2*1Square+2*1+1so S1=5 and S2=2*2square+2*2+1 So S2=13And d i.e common difference=S2-2*S1And d=3And a10=a+9d We know that s1=a so a10=5+9*3 The ans is 32 | |