Question
What is the unit digit of (217)413 ×
(819)547 × (414)624 × (342)812?Solution
Power series of 7 i.e unit digit 7 power expansion has 7,9,3 and 1 and it is raised to power 413 i.e 413/4 remainder 1 and so last digit is 7 Power series of 9 i.e unit digit 9 power expansion has 9 and 1 and it is raised to power 547 i.e 547/2 remainder 1 and so last digit is 9 Power series of 4 i.e unit digit 4 power expansion has 4 and 6 and it is raised to power 624 i.e 624/2 remainder 0 and so last digit is 6 Power series of 2 i.e units digit 2 power expansion has 2,4,8 and 6 and it is raised to power 812 i.e 812/4 remainder 0 and so last digit is 6 All the last digits product=7*9*6*6 =8
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