Mathematics, 07.07.2019 05:00, timozy95
Find the sum of all the multiples of 7 in between of 1 and 100
Answers: 1
= 
[ 2a + (n - 1 )d ]
= 7 [ ( 2 × 7 ) + (13 × 7 ) ] = 7 ( 14 + 91 ) = 735
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