Question

143+154+165+.......+407=?​

Answer 1

143

+ 154

+ 165

+ 131

+ 407

= 1000

hope it helps...

Answer 2

ANSWER.6875

Step-by-step explanation:

as it is a AP of difference 11 so on application of formula of sum of AP n÷2(fist term+ last term)

so last term is 407

407=143+(n-1)11

so n=25

25÷2(143+407)=6875