Book Maths Puzzle Numerical Ability Number System

what power of 210 will exactly divide 142

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Book Other Question

a 4 digit number is formed using the digits 0,2,4,6,8 without repeating.what is the sum of all possible numbers? find out the probability of forming 187 or 215 with the digits 1,2,3,4,5,6,7,8,9, when only numbers of 3 digits are formed and when
1) repetitions are not allowed and when
2) repetitions are allowed