Math, asked by sp219305, 10 months ago

if 18 ,a,b, -3 are in a.p then a+ b​

Answers

Answered by Ravi942004
5

Answer:

a=18

t4=a+(n-1)d

-3=18+3d

-3-18=3d

-21=3d

d=-21÷3

d=-7

a=18+-7

a=11

b=11+a=11+-7=4

a+b=11+4

=15

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