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Anvisha [2.4K]
4 years ago
13

I need help for a test pla

Mathematics
1 answer:
laiz [17]4 years ago
8 0

Option C:

161

Solution:

Given data:

$\sum_{n=2}^{8}-2+5 n

To solve this expression:

$\sum_{n=2}^{8}-2+5 n

Summation means sum of all the numbers.

Substitute n = 2 in the summation.

-2+5(2) = -2+10=8

Substitute n = 3 in the summation.

-2+5(3) = -2+15=13

Substitute n = 4 in the summation.

-2+5(4) = -2+20=18

Substitute n = 5 in the summation.

-2+5(5) = -2+25=23

Substitute n = 6 in the summation.

-2+5(6) = -2+30=28

Substitute n = 7 in the summation.

-2+5(7) = -2+35=33

Substitute n = 8 in the summation.

-2+5(8) = -2+40=38

Sum of all numbers = 8 + 13 + 18 + 23 + 28 + 33 + 38

                                 = 161

$\sum_{n=2}^{8}-2+5 n=161

Option C is the correct answer.

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