2025 MGS(S) PRELIMS P1 Q6

2025 MGS(S) PRELIMS P1 Q6

Secondary 4
4 marks

Written as products of prime factors, \(240=2^4\times3\times5\) and \(2750=2\times5^3\times11\).

    1. Find the smallest positive integer \(n\) for which \(\sqrt{2750n}\) is a whole number.[2]
    2. Find the smallest positive integer \(k\) for which \(240k\) is a multiple of 2750.[1]
  1. \(Y=a^{18}\times b^{12}\times c^{36}\), where \(a\), \(b\) and \(c\) are prime numbers. Explain why \(Y\) is a perfect cube.[1]

Solution:

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Answer:(a)(i) \(110\) (a)(ii) \(275\) (b) \(Y=(a^6b^4c^{12})^3\)

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