Please tell

Asked by  | 19th Dec, 2008, 06:22: PM

Expert Answer:

let the first term be a and common difference be d.

so last three terms will be 19th,20th,21st

so a+18d + a+19d + a+20d = 237

similarly middle three terms 10th, 11th and 12th

so a+9d+a+10d+a+11d = 129

so we have two equations and two unknowns.

solve for a and d,

and A.P. will be a, a+d, a+2d, a+2d,....

Answered by  | 19th Dec, 2008, 07:32: PM

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