# 23a7b is divisible by 45 but not by 10. Find the value of a. Option 1) Option 2) Option 3) Option 4) Option 5)

Number which is divisible by 45 should be divisible by 5 and 9 but not by 10

Last digit must be 5 not 0

$B=5$

$2+3+a+7+5 \: must\: be\: divisible\: by\: 9$

$17+a$

$A=1$

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