Consider the following number pattern
1
2 3 4
5 6 7 8 9
10 11 12 13 14 15 16
.......................................
a.write the next two lines
b.write the sequence number of numbers in each rows
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17 18 10 20 21 22 23 24 25
26 27 28 29 30 31 32 33 34 35 36
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