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14 changes: 14 additions & 0 deletions C#/25.1000 FIBONACCI NUMBER/RudaniNishant.CS
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// Project Euler Problem No 25
int i = 0;
int cnt = 2;
BigInteger limit = BigInteger.Pow(10, 999);
BigInteger[] fib = new BigInteger[3];

fib[0] = 1;
fib[2] = 1;

while (fib[i] <= limit) {
i = (i + 1) % 3;
cnt++;
fib[i] = fib[(i + 1) % 3] + fib[(i + 2) % 3];
}
2 changes: 1 addition & 1 deletion README.md
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Expand Up @@ -54,7 +54,7 @@ Happy Contributing! 😃
| 22 | [Names scores](https://projecteuler.net/problem=22) | | | | :white_check_mark: | | | | | | | | |
| 23 | [Non-abundant sums](https://projecteuler.net/problem=23) | | | | | | | | | | | | |
| 24 | [Lexicographic permutations](https://projecteuler.net/problem=24) | | | | | | | | | | | | |
| 25 | [1000-digit Fibonacci number](https://projecteuler.net/problem=25) | | | | :white_check_mark: | | | | | | | | |
| 25 | [1000-digit Fibonacci number](https://projecteuler.net/problem=25) | | | | :white_check_mark: | | | | :white_check_mark: | | | | |
| 26 | [Reciprocal cycles](https://projecteuler.net/problem=26) | | | | | | | | | | | | |
| 27 | [Quadratic primes](https://projecteuler.net/problem=27) | | :white_check_mark: | | | | | | | | | | |
| 28 | [Number spiral diagonals](https://projecteuler.net/problem=28) | :white_check_mark: | :white_check_mark: | | :white_check_mark: | | | :white_check_mark: | | | | | |
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