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bilangan asli yaitu :
30, 31, 32, 33, 34, 35...........175
bilangan yg habis dibagi tiga tetapi tidak habis dibagi 5 adalah:
33, 36, 39, 42, 48, 51, 54, 57, 63, 66, 69, 72, 78, 81, 84, 87, 93, 96, 99, 102, 108, 111, 114, 117, 123, 126, 129, 132, 138, 141, 144, 147, 153, 156, 159, 162, 168, 171, 174,
jumlahnya?
= 33 + 36 + 39 + 42 + 48 + 51 + 54 + 57 + 63 + 66 + 69 + 72 + 78 + 81 + 84 + 87 + 93 + 96 + 99 + 102 + 108 + 111 + 114 + 117 + 123 + 126 + 129 + 132 + 138 + 141 + 144 + 147 + 153 + 156 + 159 + 162 + 168 + 171 + 174
= 4023