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2^20 or 1048576 terms
ReplyDeleteEr, should be 3^20, or 3486784401 terms.
ReplyDeleteAt least one. If a+b+c=1 then 1^20=1.
ReplyDelete3^20 is the number of terms not simplified, i.e., it woulb be a lot of identical terms that wwe can add up.
ReplyDeleteThe answer is "combinations", where n=3; r=20. The order is not important and repetition is allowed.
(n+r-1)!/r!(n-1)!= 231