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ella [17]
2 years ago
6

Plzz answer fast I know what it is but I need to double check!!!!!

Mathematics
2 answers:
alukav5142 [94]2 years ago
4 0

Answer:

it's B

Step-by-step explanation:

just solve them and they match

irina1246 [14]2 years ago
3 0

Answer:

If your thinking B is the answer then you are right

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Answer:

Option b is correct 175

Step-by-step explanation:

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put k = 7 in above eq. for finding first term

 a2 = 3(7) - 2 = 21 - 2 = 19

 a3 = 3 (8) - 2 = 24 - 2 = 22

16, 19 , 22, ...  //Arithmetic series formation

a1 = 16 , a2 = 19

d = a2 - a1 = 19 - 16 = 3 //Difference of first two terms

Using sum forumula for arithmetic series

sum = \frac{n}{2}(2a1 + (n-1)d)

      = \frac{7}{2}(2a1 + (7-1)d)

      = \frac{7}{2}(2(16) + (6)3)

      =  \frac{7}{2}(32 + 18)    

      =  \frac{7}{2}(50)

      = 7 * 25

      = 175




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2 years ago
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