Mathematics 2015 JAMB Past Questions

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If log₅20 = x, find x

A. 1.761
B. 1.354
C. 1.861
D. 2.549

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Find at which rate per annum simple interest N525 will amount to N588 in 3 years.

A. 3%
B. 2%
C. 5%
D. 4%

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Given that A = {1, 5, 7}

B = {3, 9, 12, 15}

C = {2, 4, 6, 8}

Find (A ∪ B) ∪ C

A. {1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 15}
B. {1, 2, 3, 5, 6, 8, 12, 15}
C. {2, 4, 5, 9, 12, 15}
D. {1, 5, 6, 7, 8, 9, 12, 15}

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The extension of a stretched string is directly proportional to its tension. If the extension produced by a tension of 8 Newton’s is 2cm, find the extension produced by a tension of 12 newton’s.

A. 2
B. 1
C. 0
D. 3

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Factorize \( x^2 − 2x − 15 \)

A. (x + 3)²
B. (x + 5)(x − 3)
C. (x − 5)²
D. (x − 5)(x + 3)

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