Question

Write the sequence whose nth term is 3-5n. is it an AP?​

Answer 1

Step-by-step explanation:

Let n be 1,2,3,...

3-5n=3-5(1)→. 3-5→. -2

3-5(2)→3-10→. -7

3-5(3)→3-15→. -12

Checking AP:

D1= a2- a1= -7-(-2)=-5

D2=a3- a2= -12-(-7)=-5

D2=D1

Therefore, -2,-7,-12... is an AP