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Applied Arithmetic Progression
- Thread starter Dhatsah
- Start date
D
Deleted member 4993
Guest
I have a problem I cannot see how to solve.
Sum of all elements = 522
Common difference is 1
last element has a value of 32
Q1 How many elements are there in total.
Q2 What is the value of the first element.
Any help would be appreciated.
Assume:
First element = a
no of element = N
What is the expression for last element?
What is the expression for sum of the elements?
Assume:
First element = a
no of element = N
What is the expression for last element?
What is the expression for sum of the elements?
I need to correct myself d= -1
The expression for the last element would a(n)?
and to sum all the elements you would do n(a(1) + a(n))/2? I think.
D
Deleted member 4993
Guest
I need to correct myself d= -1
The expression for the last element would a(n)?
and to sum all the elements you would do n(a(1) + a(n))/2? I think.
That would be strictly correct for d = 1
The expression for last element (n th element) = a(1) + (n-1) * d
for d= -1
a(n) = a(1) - n + 1
Now continue....