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Solution :

N = 9,9,9......99 times ÷ 13 = then what is the remainder ?

Formula = If Any number is divided by a prime number, then formula will be ( P - 1 ) times ÷ P ( P = Prime Numer = 13 ) ,
(13 - 1) times ÷ 13 = 12 times ÷ 13 ,
Now find the maximum number which is less than 99( times )can be get by multiplying with 12 .
12 × 8 = 96, 12× 9 = 108 ( Exceeds 99 ). So let's take 12 × 8 = 96 times. Now we have left with 99-96 = 3 times ( 9 for 3 times) . So we can easily divide the number 999 ÷ 13 = the remainder will be 11.
Hence Answer : A) 11 ✅

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