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29=2n-1=2(15) -1..............n=15
A=15²=225
B = 2 + 4 + 6 + 8 + ... + 28
28=2n=2(14)....................n=14
B=14(15)=210
Como A=225 y B=210
A+B=435
12. 4aa5+
b45b
abba
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21120
espero haberte ayudado