Question
What is the unit digit of the number 'A' obtained by
subtracting the largest two-digit prime number from the least common multiple (LCM) of all single-digit prime numbers?Solution
ATQ;
LCM of all single-digit prime numbers = (2 × 3 × 5 × 7) = 210
So, 'A' = 210 - 71 = 139
Unit digit of 'A' = 9
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