Find the sum of the given ap 20 ,13,6, −1,…..18 terms
pls give the right answer
no spam
for gods sake .

2 thoughts on “Find the sum of the given ap 20 ,13,6, −1,…..18 terms<br /> pls give the right answer <br /> no spam <br /> for gods sake .”

1. Answer:

   711

   Step-by-step explanation:

   given : ap:20,13,6,-1

   a=20

   d=13-20=-7

   n=18

   sn=?

   formula

   sn=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

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2. 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

   now I have helped you…no spam…no joke i had put

   Please mark me as brainliest…may god bless you

   Reply