Question

Dante is making a necklace with 18 rows of tiny beads in which the number of beads per row is given by the series 3 + 10 + 17 + 24 + ...

a. Use summation notation to write the series, give
i.the lower limit of the sum
ii.the upper limit of the sum
iii.the explicit formula of the sum
b. Find the total number of beads in the necklace. Explain your method for finding the total number of beads.

Answer 1

I only need help with part a iii

Answer 2

a(18)=3+(3-1)7

would that be right?

Answer 3

@jhonyy9 @Anaise @alexalc @brian.edu @DiamondAnon2 @sammixboo

Answer 4

lol calling everyone!

Answer 5

do you see how many is the difference between two terms ?

Answer 6

yeah can u check my work.

Answer 7

where is ?

Answer 8

first comment
2nd comment

Answer 9

ok

a_1 = ? what will be the right formula of this series ?

Answer 10

and so a_n = ?

Answer 11

a_1 = 3

a_2 = a_1 +7 = 3+7 = 10
a_3 = a_2 +7 = 10 +7 = 17

-----
a_18 = ?

Answer 12

what you wrote above for a_18 not can being right because from there result 17 and thatn you check it the term a_3 is equal 17 so a_18 not can being 17 too

Answer 13

i dont get it

Answer 14

can you tell me what the equation is?

Answer 15

sorry

Answer 16

?

Answer 17

ohh i get it i think

Answer 18

a_1 = 3
a_2 = 10 = a_1 +7
a_3 = 17 = a_2 +7

Answer 19

a(18)=a(17)+7

Answer 20

yes this i ve wrote above too for term a_18 than you check it there

Answer 21

ok ty

Answer 22

@DiamondAnon2 what is your idea please ? - write it here - thank you

Answer 23

Oh I did not want to interrupt, but I have another question.

Answer 24

bc. i saw you started writing anything - yes ?

Answer 25

@DiamondAnon2 please

Answer 26

I just have another question. But i do not want to stop you from helping moss.

Answer 27

ok. post it there and tag me there please - and i will try helping you too

Answer 28

Moss ok ?