In 2013, Henry bought a painting. In 2017, Henry sold the painting to Maria.
He made a profit of 20%

In 2018, Maria sold the painting for £604 800.
She made a loss of 10%

Work out how much Henry paid for the painting in 2013.

, 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

probably the last option

step-by-step explanation: