how many 4 digit number uniquely is divisible by 11
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THE FIRST FOUR DIGIT NUMBER DIVISIBLE BY 11 IS 1001 THE LAST NUMBER IS 9999
THEREFORE A=1001 D=11 N=? TN= 9999
TN = A+(N-1)D
9999 = 1001+ 11N -11
9999 = 990+11N
9009 = 11N
N= 819
THEREFORE A=1001 D=11 N=? TN= 9999
TN = A+(N-1)D
9999 = 1001+ 11N -11
9999 = 990+11N
9009 = 11N
N= 819
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