Question

in an ap A4=1/5 a5= 1/4 then find s20​

Answer 1

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Step-by-step explanation:

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Answer 2

Answer:

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Step-by-step explanation:

common difference, d=a2-a1 =1/4-(-1) =1/4+1 =5/4

next 4 terms are a4,a5,a6,a7

here a4= a+3d= (-1)+3(5/4) =11/4

a5=a+4d=(-1)+4(5/4) =4

a6=a+5d=(-1)+5(5/4) =21/4

a7=a+6d=(-1)+6(5/4)= (15/2)-1 = 13/2 or 26/4