JAMB Mathematics Past Questions & Answers - Page 87

431.

Find the 7th term of the sequence: 2, 5, 10, 17, 6,...

A.

37

B.

48

C.

50

D.

63

Correct answer is C

No explanation has been provided for this answer.

432.

If \(\frac{27^x \times 3^{1 - x}}{9^{2x}} = 1\), find the value of x.

A.

1

B.

\(\frac{1}{2}\)

C.

  • C.

  • D.

    -1

    Correct answer is B

    \(\frac{27^x \times 3^{1 - x}}{9^{2x}} = 1\)

    \(\frac{3^{3x} \times 3^{1 - x}}{3^{2(2 - x)}} = 3^0\)

    \(3^{3x} \times 3^{1 - x} \div 3^{4x} = 3^0\)

    \(3^{(3x + 1 - x - 4x)} = 3^0\)

    \(3^{(1 - 2x)} = 3^0\)

    since the bases are equal,

    1 - 2x = 0

    - 2x = -1

    x = \(\frac{1}{2}\)

    433.

    A trader bought an engine for $15,000.00 outside Nigeria. If the exchange rate is $0.075 to N1.00, how much did the engine cost in Naira?

    A.

    N250,000.00

    B.

    N200,000.00

    C.

    N150,000.00

    D.

    N100,000.00

    Correct answer is B

    N1.00 = $0.075

    N X = $15,000

    X = \(\frac{1.00 \times 15000}{0.075}\)

    = N200,000.00

    434.

    The sum 110112, 11112 and 10m10n02. Find the value of m and n.

    A.

    m = 0, n = 0

    B.

    m = 1, n = 0

    C.

    m = 0, n = 1

    D.

    m = 1, n = 1

    Correct answer is C

    No explanation has been provided for this answer.

    435.

    If {X: 2 d- x d- 19; X integer} and 7 + x = 4 (mod 9), find the highest value of x

    A.

    2

    B.

    5

    C.

    15

    D.

    18

    Correct answer is C

    No explanation has been provided for this answer.