Find a seven digits number

Algebra Level 2

Find a number that has seven digits: a 1 a 2 . . . a 7 a_{1}a_{2}...a_{7} That satisfies: a 1 a 2 . . . a 7 × 4 = a 7 a 6 . . . a 1 . a_{1}a_{2}...a_{7} \times 4 = a_{7}a_{6}...a_{1}.


The answer is 2199978.

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1 solution

The series 21978 ,219978....when multiplied with 4 gives the reverse of the number! :)

Why ? can you show us the steps please ?

anoir trabelsi - 6 years, 11 months ago

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