Find the sum of AP:(-5)+(-8)+(-11)+...........(-230).
Attachments:
Answers
Answered by
2
Answer:
a = -5. and d = 3
n = 74
sum = n/2{2a + (n - 1) d}
= 74/2 { -5×2 + ( 74 - 1 ) 3}
= 36 { -10 + (73×3)}
= 36 { -10 + 219}
= 36 × 209
= 7,524 ans
Similar questions