find the sum of all multiples of 7 lying between 500 and 900
Answers
Answered by
5
A.P. = 504,511,.............,896 which multiples of 7 then, An= A +(n-1) xd == 896=504 +(n-1) x7 then we get, n=57 Sn=n/2 (A+An) == 57/2(504+896) then, Sn= 39900
Answered by
1
Answer:
Step-by-step explanation:
Attachments:
Similar questions