Question

the sum of three consecutive terms of an A.P. is 21 and then find the 1st term​

Answer 1

Answer:

consecutive means number coming after each other like 1+2+3

so

let the consecutive number be

a+a+1+a+2=21

3a+3=21

a+3=21/3

a=7-3

a=5

the numbers are

5

5+1=6

5+2=7

therefore the first that is a=5

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