Question

What is term of AP 18, 15....._75

Answer 1

Answer:

nth term= ?

a = 18

d = 15-18= -3

last term = -75

• l = a+ ( n-1) d
• -75 = 18 + (n-1) -3
• -75-18 = (n-1) -3
• -93 =( n-1) -3
• -93/-3 = n-1
• 31 = n-1
• 31+1 = n
• n = 32. (ans.)