Mathematics Past Questions and Answers

A 24N force acts on a body such that it changes its velocity from 5m/s to 9m/s in 2 secs.If the body is travelling in a straight line, calculate the distance covered in the period.

A 22m
B 18m
C 14m
D 10m

Question 327:

Given that \(y = 4 - 9x\) and \(\Delta x = 0.1\), calculate \(\Delta y\).

A 9.0
B 0.9
C -0.3
D -0.9

Question 328:

Four fair coins are tossed once. Calculate the probability of having equal heads and tails.

A \(\frac{1}{4}\)
B \(\frac{3}{8}\)
C \(\frac{1}{2}\)
D \(\frac{15}{16}\)

Question 329:

In calculating the mean of 8 numbers, a boy mistakenly used 17 instead of 25 as one of the numbers. If he obtained 20 as the mean, find the correct mean.

A 24
B 23
C 21
D 19

Question 330:

Simplify: \(^{n}C_{r} à· ^{n}C_{r-1}\)

A \(\frac{n(n-r)}{r}\)
B \(\frac{n}{r(n-r)}\)
C \(\frac{1}{r(n-r)}\)
D \(\frac{n+1-r}{r}\)