Question

Find The value......​

Answer 1

Answer:

550

Step-by-step explanation:

sigma1 to 10 (10×i) i= 1 to 10

= 10×1+10×2+10×3+...............10×10

= 10 ( 1+2+3+4+...........+8+9+10)

= 10×( 10×11)/2

= 550

formula used. => 1+2+3+4+.........n

= n(n+1)/2