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Find the sum of the given ap 20 ,13,6, −1,…..18 terms

pls give the right answer

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for gods sake .

Question

Find the sum of the given ap 20 ,13,6, −1,…..18 terms

pls give the right answer

no spam

for gods sake .

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Mathematics
2 years
2021-07-24T05:16:13+00:00
2021-07-24T05:16:13+00:00 2 Answers
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## Answers ( )

Answer:711Step-by-step explanation:given: ap:20,13,6,-1## a=20

## d=13-20=-7

## n=18

## sn=?

formulasn=n/2[2a+(n-1)d]

sn=18/2[2(20)+(18-1)-7]

sn=9[40+19*-7]

sn=9[40-119]

sn=9[79]

sn=711

Answer:a=20

d= -7

n=18

put the values in the formula and you will get answer

n/2[2a + (n – 1)d]Step-by-step explanation:this formula is used to find sum of terms of ap for a given value of n…which is number of terms

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