A tricky question from Harvard Entrance Exams | No Calculator Allowed 📵

A tricky question from Harvard Entrance Exams | No Calculator Allowed 📵 #maths
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[@pamnetwork7787]

Nice

[@RealQinnMalloryu4]

5^7^1 ➖ 6 5^1^1 ➖ 2^3 1^1➖ 2^3 2^3 (x ➖ 3x+2).

[@RyanLewis-Johnson-wq6xs]

5^7-6=78119

[@raghvendrasingh1289]

5^7 = 625×125
= (600+25)(100+25)
= 60000+ 15000+2500+625 = 78125
Answer is 78119

[@davidseed2939]

5
25
125
625
3125 from memory
15625
75000+3125=78125
782125-6=782119