Write the next two numbers in the sequence: 1, 3, 6, 10, 15...*

21,28

Step-by-step explanation:

3-1=2       2+1=3

6-3=3        3+3=6

10-6=4       4+6=10

15-10=5       5+10=15

                   6+15=21

                   7+21=28

answer: 270

step-by-step explanation:

you have to times 200 by 1.35 to get your answer

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