Question

For an AP 21, 18, 15 .... Find 10th term.​

Answer 1

Answer:

The 10th term is -6

Step-by-step explanation:

21, 18, 15 ..

a = 21

d = a₂ - a₁

d = 18-21

d = -3

here n = 10

Use formula:

aₙ = a+ (n-1)d

a₁₀ = 21 + (10-1)(-3)

    = 21 + 9(-3)

   = 21 - 27

  = -6