Question

following sequence is an A P., if so find the 20th term of the . decide whether
-12, -5, 2,9,16,23,30
​progression​

Answer 1

Answer:

Yes , it forms an AP

Step-by-step explanation:

a= -12 d=7  n=20

an = a+(n-1)d

  a20  = -12 + 19x7

      = -12+ 133

     =  121

Answer 2

AP = -12, COMMON DIFFERENCE = t2 - t1

= -5 - -12

so, d= 7

Step-by-step explanation:

so, formula = tn = a+(n-1) d

so, t20 = -12 + ( 20 -1 ) 7

= -12 + 19 (7)

= -12 + 133

= 121

so, t20 = 121