find the sum of the first 20 term of AP -2,-5,-8,-11..
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S(20)=10(-2+76)
=10×74=740
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Answer:
a=-2 d=3
Sn= n÷2[2a+(n-1)d]
S20=20÷2[2× -2+(20-1) ×3]
=10×(-2+ 19×3)
=10×(-2 +57)
=10×55
=550
Answer:- sum of first 20 term is 550
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