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What is the highest power of 5 that divides 90 × 80 × 70 × 60 × 50 × 40 × 30 × 20 × 10 (a) 10 (b) 12 (c) 14 (d) 15 |
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Answer» (a) 10 All the numbers that are multiplied have 0 as units' digit, so all of them are divisible by 5 once. Also 50 can be divided by 52 . So the highest power of 5 that divides the given product = (9 + 1) = 10. |
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