If sum of digits of n and 2n are same, prove that 9 divides n.
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U can use the hit and trial method...
calculate the sum of the n no. of digits... then calculate the sum of 2n no. of digits..
you'll get two equations which will be both divisible by 9.
calculate the sum of the n no. of digits... then calculate the sum of 2n no. of digits..
you'll get two equations which will be both divisible by 9.
Pprraannaavv:
More define pls
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