Others Maths Puzzle

Nimai wrote all natural numbers, none of whose digits is a prime number, in order. First ten numbers which Nimai wrote are as follows: 1, 4, 6, 8, 9, 10, 11, 14, 16, 18. What is the 123rd number, Nimai might be writing?

A. 646
B. 666
C. 816
D. 840

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Others Other Question
On planet LOGIKA, an alien digit φ is being used between 3 and 4 along with all the usual digit we use on earth. What will be the age of a 94 years old inhabitant of LOGIKA on earth?

A. 103
B. 104
C. 114
D. 115 What is the highest power of 2 which divides [10²ºººº/(10¹ºº + 2)] completely where [x] is greatest integer less than or equal to x?

A. 99
B. 100
C. 199
D. 200