MATHS! URGENT!
posted by Ami .
describe how each sequence is generated and write down the next two terms:
a) 40 41 43 46 50 55
b)90 89 87 84 80 75
c)1 3 7 13 21 31
d) 2 6 12 20 30 42
PLEASE HELP its urgent!

Even I can see what's happening with the first one:
add 1, then add 2, then add 3, then add 4, etc.
Turn your imagination loose and see what you find. These are not difficult.
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