state and write the divisibility test by 11. give suitable examples.
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Add the digits in blocks of two from right to left. The result must be divisible by 11.
Examples 627: 6 + 27 = 33 = 3 × 11.
Subtract the last digit from the rest. The result must be divisible by 11.
627: 62 − 7 = 55 = 5 × 11.
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