sir 1X1+[ 1X1+2X2]+[1X1+2X2+3X3]................. FIND SUM

Asked by era.singh | 7th Oct, 2009, 02:01: AM

Expert Answer:

The series is:

12 + (12+22) + (12+22+32) +..........................

The nth term is given by: 12+22+32.........................n terms

 

Answered by  | 7th Oct, 2009, 12:26: PM

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