Evaluate 1+2+3.......+100.Using this value find 7+14+21+......+700
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1-100
Sn=. 100/2[2*1+(100-1)*1]
50*(2+99)
50*101
=5050
See solution in pic
Hope it will help you
Sn=. 100/2[2*1+(100-1)*1]
50*(2+99)
50*101
=5050
See solution in pic
Hope it will help you
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akhil12332:
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