Question

the sum of all integers between 50 and 350 which ends with 1 is

Answer 1

☜☆☞hey friend!!!! ☜☆☞

here is your answer ☞

Solution =>

51+61+71...+341 is an arithmetic progression
to find the sum of n terms of an ap we use the formula

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

as n=30 and a= 51

=30/2 [2×51+(30-1) 10]

=15[102+290]

=15×392

=5880______answer

hope it will help you..

Answer 2

Answer:

d is the ans

Step-by-step explanation:

51+61+71...+341 is an arithmetic progression

to find the sum of n terms of an ap we use the formula

S=n/2 [2a+(n-1) d] 

as n=30 and a= 51

=30/2 [2*51+(30-1) 10]

=15[102+290] 

=15* 392

=5880

 

d) 5880 . is the correct answer