Answer:
an = 1/2 (n) (n+1)
Step-by-step explanation:
1,3,6,10,.........
3-1=2
6-3=3
Each term is different so there is no common difference. It is not an arithmetic sequence
3/1=3
6/3 =2
Each term is different so there is no common ratio. It is not a geometric sequence
1 3 6 10
+2 +3 +4
a1 = 1
a2 = 3
a3 = 6 = 2*3
a4 = 10 = 2*5
If the number is between 25 and 35 It would have to be either 28 or 32.
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Hello.
The answer is
equilateral triangles
<span>All equilateral triangles are exactly the same as one another. They have the same size sides and the same shapes.
</span>
Have a nice day
The answer is a . because i said so .
