Explain the formulas of APs:-
1) S=n/2(2a+(n-1)d
2)Sn=n(n+1)/2
Are these 2 formulas the same ?
Where all to use them ?
Pls Explain
Answers
Answer:
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Answer:
The first formula is for the sum of n terms of an A.P . where n is the no. of terms of which you want to find the sum, a is the first , d is the common difference . 2. the second formula is nothing but when you put a = 1 and d =1 in the above formula .
Step-by-step explanation:
also when you have to find the sum of first n natural numbers the second formula is used . for ex if you have to find the sum of first 10 natural numbers put a =1 and d =1 in both the formula you will get the same answer . the second formula is more precised one and works if a=1 and d=1 . also you can put a =2 and d=2 in the first formula and you will have a another form. for a=2 and d=2.