Fie S1 suma data
1/2*2<1/1*2=1-1/2=1/2
2/3*3<2/2*3=1/3
3/4²<3/3*4=1/4
...........................
63/64²<63/63*64=1/64
deci suma noastra este mai mica decat S2= 1/2+1/3+1/4+...+1/64
dar 1/2+1/3<1/2+1/2=1
1/4+1/5+1/6+1/7<1/4=1/4+1/4+1/4+1/4=1
1/8+1/9+....+1/15<1/8+1/8+..+1/8 de 8 ori=1
1/16+1/17+....+1/31<1/16=1/16+...+1/16 de 16 ori=1
1/32+1/33+...+1/63<1/32=1/32+...+1/32 de 32 de ori=1
deci S1 <S2<1+1+1+1+1=5
probabil a tastat cineva (tu sau cine a dat exercitiul sau cine a redactat culegrea) gresit 6...
