NECO Mathematics Past Questions & Answers - Page 17

81.

A bag Contains 2 red, 3 blue and 4 green identical balls. If two balls are picked at random one after the other without replacement, what is the probability that both are green?

A.

\(\frac{1}{6}\)

B.

\(\frac{1}{3}\)

C.

\(\frac{16}{18}\)

D.

\(\frac{3}{8}\)

E.

\(\frac{4}{9}\)

Correct answer is A

No explanation has been provided for this answer.

82.

The diagonals of a rhombus are 16cm and 30cm long. What is the perimeter of the rhombus

A.

68cm

B.

72cm

C.

80cm

D.

88cm

E.

92cm

Correct answer is A

No explanation has been provided for this answer.

83.

If the mean of the following set of data, 2, 3,3,3, 2,4 4 and 3 is divided by its mode, the result is:

A.

1

B.

2

C.

3

D.

5

E.

8

Correct answer is A

No explanation has been provided for this answer.

84.

The 4th term of a G.P is 3 and its first term is 81. What is its common ratio?

A.

3

B.

\(\frac{2}{3}\)

C.

\(\frac{1}{3}\)

D.

-\(\frac{1}{3}\)

E.

-3

Correct answer is C

No explanation has been provided for this answer.

85.

Express the quotient of 0.422 and 0.004 in standard form

A.

1.055 × 102

B.

10.55 × 101

C.

105 × 100

D.

10.55 × 10-1

E.

1.055 × 10-2

Correct answer is A

= \(\frac{0.422}{0.004}\)

= \(\frac{4.22 \times 10^{-1}}{4 \times 10^{-3}}\)

= \(1.055 \times 10^{-1 - (-3)}\)

= \(1.055 \times 10^2\)