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Last updated at April 16, 2024 by Teachoo
Question 1 If 21y5 is a multiple of 9, where y is a digit, what is the value of y? We know that, A Number is divisible by 9, if sum of digits is divisible by 9 21y5 Sum of digits = 2 + 1 + y + 5 = 8 + y Let us check different values of y & check if number is divisible by 9 Sum of digits = 8 + y