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Arithmetic progression

1)Find the number of multiple of 6 between 10 and 100. Hence, calculate the sum of the multiples.



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Answer:

the number of multiple of 6 between 10 and 100

6 12 18 24 30 36 42 48 54 60 66 72 78 84 90

the sum of the multiples

6+12+18+24+30+36+42+48+54+60+66+72+78+84+90 =720

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