Question
How many such pairs of digits are there in the number
'84378965' each of which has as many digits between them in the number both forward and backward direction as they have between them in the number system?Solution
78, 79, 89, 56, 58, 68 and 34 are seven such pairs of digits are there in the number '84378965' each of which has as many digits between them in the number both forward and backward direction as they have between them in the number system .
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