Which statement is not true of frequency tables? a.) the number of tallies should equal the sum of frequencies. b.) if there are intervals, they should always be 5. c.) the size of the sample is the sum of the frequencies. d.) numerical data or categorical data can be shown.

its b

Step-by-step explanation:

21

step-by-step explanation:

, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for