Question

find the sum of 3 + 6 + 9 + ........120​

Answer 1

Answer:

3+6+9+12+15+18+21+24+12=120

Step-by-step explanation:

simplify the expression: add

Answer 2

Answer:

3 + 6+ 9 + .............= 120

let put the value of ............ be x

3+6+9+x=120

18 + x = 120

x = 120 - 18

x = 102

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