Math, asked by akhil12332, 1 year ago

Evaluate 1+2+3.......+100.Using this value find 7+14+21+......+700

Answers

Answered by divya1261
1
1-100
Sn=. 100/2[2*1+(100-1)*1]
50*(2+99)
50*101
=5050

See solution in pic


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