How many numbers among 1210, 1331, 1442, 1553 are divisible by 11?
Show answer & explanation
Correct answer: B
Explanation
Given:
Numbers = 1210, 1331, 1442, 1553
Formula:
Divisibility by 11 → (difference of alternate digits) 0 or a multiple of 11
1210 → (1 + 1) − (2 + 0) = 2 − 2 = 0
1331 → (1 + 3) − (3 + 1) = 4 − 4 = 0
1442 → (1 + 4) − (4 + 2) = 5 − 6 = -1
1553 → (1 + 5) − (5 + 3) = 6 − 8 = -2
Total = 2