Basmerve304rans
Answered

с 2. A=1+2+3+...+n B = 10 + 11 + 12 + ..... + 2n veriliyor. B-A = 347 olduğuna göre, n değeri kaçtır? A) 20 D) 14 B) 18 E) 12 C) 16
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Sagot :

Ferdi6369rans

Cevap:

C 16

Adım adım açıklama:

A=n(n+1)/2 B=2n(2n+1)/2 - 9*10/2=n(2n+1)-45

B-A=(3nkare+n)/2 - 45=347

3nkare+n=784=16*48

N=16

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