Question

find the sum of an AP 98+93.....up to 15
terms

Answer 1

Answer:

PLS check the picture for step by step explaination. Hope this helps you

Answer 2

Arithmetic Progressions :-

Arithmetic progression is a series of numbers with a common difference 'd'.

Given series,

98,93,88 ... 15 terms

Given :-

1. Common Difference :- -5

2.Firat Term :- 98

To Find:-

Sum of 15 terms.

Answer:-

945 is the sum of series.

Formula Used :-

Sn=n/2(2a+(n-1)d)

Step By Step Explaination :-

=>Sn=15/2(2(98)+(15-1)(-5)))

=>Sn=15/2(196+(14x(-5)))

=>Sn= 15/2(196-70)

=>Sn=15/2x126

=>Sn=15x63

=>S15=945

So,the sum of Series is 945 .

CORRECTION OF QUESTION:-

Find the sum of series in A.P,

=> 98,93,.......upto 15 terms...

→n-th term of A.P

=> An=a+(n-1)d

Next Topic after Arithmetic Progression is Geometric Progression !!

Ans.