2n +(2n + 1) + (2n + 2) +..... 60 = C
A+B+C = 1881
olduğuna göre, n kaçtır?
A) 9
B) 11
C) 13
1+2+...+ n = A
n+ (n + 1) + (n + 2) ..... + 2n = B
D) 15
E17
Sagot :
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