Q. 33.5( 2 Votes )

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Answer :

Given in the pattern of apples arranged,


1st row = 1 apple, 2nd row = 2 apples, 3rd row = 3 apples and 4th row = 4 apples and so on.


So, this can be expressed as 1 + 2 + 3 + 4 + …


We know that sum of numbers from 1 to n is .


A. We have to find the total number of apples in 10 rows.


Here n = 10.


Number of apples in 10 rows = = = 55 apples


B. We have to find the total number of apples in 20 rows.


Here n = 20.


Number of apples in 20 rows = = = 210 apples


Here, the series starts with 1 and the sum of every subsequent term is the sum of previous two. (Fibonacci series)



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