Question

Check whether - 321 is a term of the A.P.: 22, 15, 8, 1,......
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Answer 1

Answer:

yes

Step-by-step explanation:

a =22

d = 15 - 22 = -7

let last term l = -321

number of terms = n = [l-a]/d   +1

                                   ={-321 -22}/[-7]  +1

                                   =-343 / -7 +1

                                  = 49 +1

                                  =50

the 50 th term is -321

Answer 2

Answer:

yes

a=22

d=-7

let last term l =-321

no. of terms=n=(l-a)/d+1

=(321-22)/(-7)+1

=299/(-7)+1

=299/-6

=-42.71

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