Math, asked by bagbagfflover, 7 months ago

7+14+21 .......140=
steps and sum plz

Answers

Answered by cutiepie0073

3

Step-by-step explanation:

an= a+(n-1)d

140= 7 +(n-1)7

n=20

Sn= n/2(a + an)

Sum= 10(7+140)

sum=1470

Answered by debashishrout1981

0

Answer:

answer will be 3456

Step-by-step explanation:

hope this will help you

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