Slot -2 – Quantitative Aptitude – Modern Maths – P & C – How many two-digit numbers
How many two-digit numbers, with a non-zero digit in the units place, are there which are more than thrice the number formed by interchanging the positions of its digits?
Let the number is ab so
So the possible pair of (a,b) are (5,1), (6,1), (7,1) , (8,1) , (9,1) & (9,2)
Thus total 6 such numbers are possible.
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