For the AP:-3,-7, -11, ., can we find directly ay- a without actually

1.	For the AP:-3,-7, -11, ., can we find directly ay- a without actually findinga and a? Give reasons for your answer.302020
Answer» here a= -3d= -7+3 = -4a(n) = a + (n-1)da(30) = a + 29×(-4)a(20) = a + 19 ×(-4)a(30) - a(20) = a + 29×(-4) - a + 19×4= -116 + 76 = -40 Here d = -4 hence your answer is wrong Thanks for letting us know

For the AP:-3,-7, -11, ., can we find directly ay- a without actually findinga and a? Give reasons for your answer.302020

Answer»

here a= -3d= -7+3 = -4a(n) = a + (n-1)da(30) = a + 29×(-4)a(20) = a + 19 ×(-4)a(30) - a(20) = a + 29×(-4) - a + 19×4= -116 + 76 = -40

Here d = -4

hence your answer is wrong

Thanks for letting us know