1/(2*7)+1/(7*12)+1/(12*17)+......1/(97*102)?
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1/(2*7)+1/(7*12)+1/(12*17)+......1/(97*102)
=(1/5)*(1/2-1/7+1/7-1/12+1/12-1/17+..........+1/97-1/102)
=(1/5)*(1/2-1/102)
=(1/5)*50/102
=10/102
=5/51
=(1/5)*(1/2-1/7+1/7-1/12+1/12-1/17+..........+1/97-1/102)
=(1/5)*(1/2-1/102)
=(1/5)*50/102
=10/102
=5/51
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