Question

Find the number of terms of an AP. in which the first term is -2, the common difference is
-3 and last term is minus 17​

Answer 1

Answer:

Tn= -17, T1= -2,d= -3

Tn= t1+(n-1)d

-17 = -2+(n-1)-3

-17+2= -3n+3

-15= -3n+3

-15-3= -3n

-18=-3n

n= 6

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Answer 2

Step-by-step explanation:

a=-2& d=-3

by using formula

a+d

(-2)+(-3)

-5is second term