what is the sum of all 3 digit multiple of 7?
Answers
Answered by
2
1st 3 digit no ÷7 =105
Last 3 digit no ÷7=994
we know that
tn=a+(n-1)
994=105+(n-1)7
n=128
we also know that
Sn=n/2(l+a)
128/2(994+105)
=70336 Answer.
Last 3 digit no ÷7=994
we know that
tn=a+(n-1)
994=105+(n-1)7
n=128
we also know that
Sn=n/2(l+a)
128/2(994+105)
=70336 Answer.
Similar questions