Question

hey yaa...,a little,nope,a big help over here!​

Answer 1

Step-by-step explanation:

This ques is Ch 5 class 10

AP =10,20,30,40.......

so,

a=10. d=10. l=500

A n = a+(n-1)d

500=10+(n-1)10

500-10=(n-1)10

490=(n-1)10

490/10=n-1

49=n-1

49+1=n

50=n

Sn= n/2[2a+(n-1)d]

Sn=50/2[2*10+(50-1)10]

Sn=25[20+49*10]

Sn=25[20+490]

Sn=25[510]

Sn=12750