Question

find the sum of the following series
4.1+ 5.2+ 6.3+ 7.4+----+ 52.49.

Answer 1

4.1+5.2+6.3+7.4+8.5+9.6+10.7+11.8+12.9+13.10+14.11+15.12+16.13+17.14+18.15+19.16+20.17+21.18+22.19+23.20+24.21+25.22+26.23+27.24+28.25+29.26+30.27+31.28+32.29+33.30+34.31+35.32+36.33+37.34+38.35+39.36+40.37+41.38+42.39+43.40+44.41+45.42+46.43+47.44+48.45+49.46+50.47+51.48+52.49=1388.3
actually the answer coming is this i dont know the shortcut but the exact answer is this