Discussion
Which of the following number will be seventh to the right of tenth number from the left ?
Answer: D
The number is 5.
The tenth digit from the left is the one in position 10, and seventh to its right is position \(10 + 7 = 17\). Counting along 4 3 1 5 7 8 3 1 6 2 9 7 1 2 1 3 5 ..., position 10 is 2 and position 17 is 5.
Counting seven places from position 10 and landing on position 16 instead (an off-by-one slip) would give 3, one of the distractors.
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