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The nth termof an AP is …

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The nth termof an AP is given by-4n+15.find the sum of first 20 terms

Posted by Devanand Sagar 6 years, 10 months ago

CBSE > Class 10 > Mathematics

4 answers

Dipti Singh 6 years, 10 months ago

A1=-4(1)+15=11, A2=-4(2)+15=7 , D=7-11=-4. S20=20/2(22+19(-4))=10(22-76)=10(-54)=-540

Raj Kaushal 6 years, 10 months ago

95

Khushboo Giri 6 years, 10 months ago

an=-4n+15 a1=-4×1+15 =11 a2=-4×2+15 =7 CD=7-11 =-4 a20=a+19d =11+19×-4 =11-76 =-65

Cutie Pie ☺☺?? 6 years, 10 months ago

May be..... 18

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