Question

Which term of the progression 36 + 33 + 30 + ... is zero?

Answer 1

a = 36

d = 33 − 36

d = −3

a_n = 0

a_n = a + (n − 1)d

0 = 36 + (n − 1)(−3)

0 = 36 + 3n + 3

n = `39/3`

n = 13