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Which is the smallest no divides 11520 and gives a perfect square?
a. 1 b.2 c.5 d.6

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TCS Other Question

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An automobile has two punctured tyres. The first puncture by itself would make the tyre flat in 10 minutes. The second puncture by itself would make the tyre flat in 5 minutes. How long would it take for both punctures together to make the remaining tyre flat ?
4 minutes
5 minutes
25 minutes
15 minutes
2 1/3 minutes
solve (a3-b3)/(a2+ab+b2)?