find the sum of all multiples of 7 between 500 and 900
Answers
Answered by
18
a=504
l=896
d=7
an=a+ (n-1)d
896=504 + (n-1)7
392=(n-1)7
n-1=56
n=57
Sn=n/2(a+an)
57/2 ( 504 + 896)
57* 700=39900
l=896
d=7
an=a+ (n-1)d
896=504 + (n-1)7
392=(n-1)7
n-1=56
n=57
Sn=n/2(a+an)
57/2 ( 504 + 896)
57* 700=39900
Answered by
10
a=504
an=896
d=7
sn = n/2(2a+(n-1)d)
=896/2(2×504 +895×7
=166(1008+2737)
=166×3745
=621670
an=896
d=7
sn = n/2(2a+(n-1)d)
=896/2(2×504 +895×7
=166(1008+2737)
=166×3745
=621670
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