All the 2- digit numbers a from 19 to 93 are arranged consecutively to form a number N = 1920212223......90919293
What is the largest power of 3, which divides N.
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add numbers 19 ,20 21 till 93. (a = 19 d =1 n= 75) so (19 +93)*75/2=4200. and its only divisible by 3 . So the largest power is 1.
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