Question

Expand the following: $(1+a+b)^{3}$

Answer 1

= 1+a³+b³+3+3a+3a+3b+3b+3

= 1+a³+b³+6a+6b+6

= a³+b³+6(a+b)+7

= (a+b)(a²-ab+b²)+6(a+b)+7

= (a+b){(a²-ab+b²)+6} + 7

Answer 2

Answer:

Answer:-

Converting inclusive class interval into exclusive class interval by subtracting 0.5 to the upper limit in each inclusive class interval.

Thus, we get:-

Class Interval Frequency

149.5-153.5 7

153.5-157.5 7

157.5-161.5 15

161.5-165.5 10

165.5-169.5 5

169.5-173.5 6