SI EL NUMERAL N =(a+b) 7c8(c-b)6 es capicua; indica la suma de cifras de N
alternativas:
a)40 b)30 c)42 d)46
alternativas:
a)40 b)30 c)42 d)46
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como es CAPICUA entonces
a+b = 6 7 = c-b c = 8
entonces
7 = c-b
7 = 8-b
b = 8-7
b= 1
a+b = 6
a+1 = 6
a = 6-1
a = 5
(a+b) 7c8(c-b)6
(5+1)788(8-1)6
678876
la suma de sus cifras es
6+7+8+8+7+6 = 42