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The nth term of an AP is given by - 4n+15 . find first 20 terms of these AP. |
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Answer» Ek or question h Thnks kabir ji Sorry first 20 terms are 11,7,3,-1,-5,-9,-13,-17,-21,-25,-29,-33,-37,-41, -45,-49,-53,-57,-61,-65... Put n=1,2,3 In -4n+15A1 = -4*1+15 =11 A2. =-4*2+15=7. A3 =-4*3+15 =3. D= A2 - A1 D= 7 -11 =-4A20. = A1 + 19D = 11+(19*-4) = 11-76 -65.... Solution pls -65.... |
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