Find the sum of multiple of 7 between 100 & 400
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multiple of 7 are: 105,112,119..........399
a=105,d=112-105=7,l=399
no. of terms=(399-105)/7 +1=42+1=43
The sum of multiples=Sn=n/2(a+l)
=43/2(399+105)=43/2 (504)
43×252=10836.
no.of terms =(last term-first term)/common difference. +1
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