23a7b is divisible by 45 but not by 10. Find the value of a.
Number which is divisible by 45 should be divisible by 5 and 9 but not by 10
Last digit must be 5 not 0
0, 2, 8, 14, ?, 34
1, 4, 2, 8, 6, 24, 22, 88, ?
1, 4, 9, 16, 25, ?
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