An intelligence agency forms a code of two distinct digits selected from 0,1,2,…….,9 such that the first digit of the code is nonzero. The code, handwritten on a slip, can however potentially create confusion when and read upside down – for example, the code 91 may appear as 16. how many codes are there for which no such confusion can arise
A.
80
B.
78
C.
71
D.
69
Correct Answer : B

Question

An intelligence agency forms a code of two distinct digits selected from 0,1,2,…….,9 such that the first digit of the code is nonzero. The code, handwritten on a slip, can however potentially create confusion when and read upside down – for example, the code 91 may appear as 16. how many codes are there for which no such confusion can arise

A.
80
B.
78
C.
71
D.
69

Correct Answer : B

A to Z Exams · Accepted Answer

78

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