Find the value of (115)−2 + (113)−2 + (112)−2.
538
269
0.226
41
The value of (115)−2 + (113)−2 + (112)−2
= 152 + 132 +122
225 + 169 + 144 = 538
Find the value of :
1-2+3-4+5-6+7-8+9-10+11-12+13-14+15