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how to calculate 5 digit's 50th position palindrome number ?

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TCS Other Question

. Smita made a cube of size 5*5*5 by using smaller cubes of 1*1*1. She created solid larger cube then she decided to make a hollow cube of the same size, can you find out how many 1*1*1 cubes will she require make hollow larger cube? suppose there are n student in a circle and teacher eliminate student in alternative manner and he eliminate students until only one is left . if he starts from 2nd position then what would be tha formula for n(integer).