Ile wyrazow ciągu geometrycznego w ktorym a1=3 i i q=4 nalezy dodac aby otrzymac 1023?
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Sn = 1023
1 - q^n
Sn = a1 * -------------
1 - q
1 - 4^n
1023 = 3 * -------------
1 - 4
1 - 4^n
1023 = 3 * -------------
- 3
1023 = - (1 - 4^n)
1023 = 4^n - 1
1023 + 1 = 4^n
1024 = 4^n
(2^2)^n = 2^10
2n = 10
n = 5 -------------- odpowiedx