Solve this

71 , 62 , 73 , 05 , 56 , ? 71,62,73,05,56,?

What is the next term? This is not a polynomial


The answer is 28.

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1 solution

Tapas Mazumdar
Apr 18, 2017

Exchange the tens and units digit of the numbers, you'll get

71 , 62 , 73 , 05 , 56 17 , 26 , 37 , 50 , 65 71,62,73,05,56 \\ \Updownarrow \\ 17,26,37,50,65

We see that the pattern from 17 17 onwards is

17 + 9 = 26 + 11 = 37 + 13 = 50 + 15 = 65 17+{\color{#3D99F6} 9}=26+{\color{#3D99F6} 11}=37+{\color{#3D99F6} 13}=50+{\color{#3D99F6} 15}=65

Hence the immediate next number would be

65 + 17 = 82 65+{\color{#3D99F6} 17} = 82

Reversing back the digits of 82 82 to fit the original order, we get

71 , 62 , 73 , 05 , 56 , 28 71,62,73,05,56, \boxed{{\color{#D61F06} 28}}

Very nice!

I Gede Arya Raditya Parameswara - 4 years, 1 month ago

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Done in the same way

Kushal Bose - 4 years, 1 month ago

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