find the sum of all multiples of 7 lying between 500 and 900
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Multiples of 7 lying b/w 500-900 are: 504,511,518,525....896
a=504, an = 896, d=7
Sn=n/2(2a+(n-1)d)
=392/2(2*504+(392-1)7)
=166(1008+391*7)
=166(1008+2737)
=166(3745)
=621670
Answered by
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Hey MATE! Multiples of 7 between 500 and 900 are : 504,511,518,525....896 a=504 last term = 896 d=7 S = n/2[2a+(n-1)d] => 392/2[2*504+(392-1)7] => 166[1008+391*7] => 166[1008+2737] => 166[3745] => 621670 Hope it helps Hakuna Matata :))
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