what is the sum of all multiples of 7 lying between 500 to 990
Answers
Answered by
1
Step-by-step explanation:
It is correct answer....
Plzzz mark it as the best....❤❤
Attachments:
Answered by
1
Answer:
AP:504,511,518,525........................987
a=504,d=7,An=987
n=??
An=a+(n-1)d
987 =504+(n-1)7
987-504=7n-7
483-7=7n
476/7=n
n=68
sn=n/2[2a+(n-1)d]
=68/2[2*504+67*7]
=34[1008+469]
=34*1477
Sn =50218
Step-by-step explanation:
may its helps u
Similar questions