Find the sum of a+b, a-b, a-3b, ...... to 22 terms.

Ans:    a + b, a - b, a - 3b, up to 22 terms d= a - b - a - b = 2b

S22 =22/2 [2(a+b)+21(-2b)]

11[2a + 2b - 42b]

= 22a - 440b Ans.

 

Posted Date: 4/8/2013 5:42:45 AM | Location : United States

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