Question

In a AP a=20,d=-3 then a30=?
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Answer 1

Step-by-step explanation:

a30= a+ (30-1)d

= 20+(29*-3)

= 20-87

= -67

Answer 2

A = 20   ,  D= -3  AND WE HAVE TO FIND OUT   A30 .....

SO, WE HAVE FORMULA FOR THIS SUM ..

and that is ,  An = a+(n-1)d

by putting the values in formula

A30 = 20 + (30 -1 ) -3

A30 = 20 + (29)-3

A30 = 20 - 87

A30 = 67

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