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Grade: 11
        
  1. prove that 1.2+2.22+3.23+............+100.2100=99.2101+2.
2 years ago

Answers : (1)

moumi roy
91 Points
							
S=1.2+2.22+3.23+............+100.2100
2S=    +1.22+2.23+..........+99.2100+100.2101
SUBSTRACTING,S=100.2101-[2+22....+2100]=100.2101-2(2100-1 )=99.2101+2.
2 years ago
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