misalkan B1 = 1+3+5+...+a, B2 = 1+3+5+...+b
= n/2 . (1+a) = n/2 . (1+b)
dan B3 = 1+3+5+....+25
= n/2 . (1+25)
maka :
B1 + B2 = B3
n/2 . (1+a) + n/2 . (1+b) = n/2 (26)
n/2 . (1+a + 1+b) = n/2 . 26
n/2 (2+a+b) = 13n
n.(1 + 1/2 . (a+b)) = 13n
1 + 1/2 . (a+b) = 13
1/2 (a+b) = 12
a+b = 24
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Itu sih menurut saya, semoga membantu.
misalkan B1 = 1+3+5+...+a, B2 = 1+3+5+...+b
= n/2 . (1+a) = n/2 . (1+b)
dan B3 = 1+3+5+....+25
= n/2 . (1+25)
maka :
B1 + B2 = B3
n/2 . (1+a) + n/2 . (1+b) = n/2 (26)
n/2 . (1+a + 1+b) = n/2 . 26
n/2 (2+a+b) = 13n
n.(1 + 1/2 . (a+b)) = 13n
1 + 1/2 . (a+b) = 13
1/2 (a+b) = 12
a+b = 24