A=1.2+2.3+3.4+...............+98.99+99.100
B=1.3+2.4+3.5+...............+99.101
C=1.4+2.5+ 3.6+..............+99.102
D=4+12+24+40+..............+1904+19800
E=1+3+6+10+.................+4851+4950
F=6+16+30+48+..............+19600+19998
G=2+5+9+14+.................+4949+5049
H=1.2.3+2.3.4+...............+98.99.100
I=12+22+32+...................+992+1002
K=22+42+62+......................+982+1002
L=12+32+52+.......................+972+992
M=12-22+32-42+....................+992-1002
N=1.22+2.32+3.42+...............+98.992
P=1.3+3.5+5.7+................+97.99+99.101
Q=2.4+4.6+6.8+................+98.100+100.102
R=13+23+33+43+.....................+993+1003