Question

An A.P consists of 60 terms .If the first and last terms be 7 and 125 find the 31st term

Answer 1

Answer:

67

Step-by-step explanation:

a = 7

n = 60

an = 125

a31 = ?

an = a + (n-1)d

125 = 7 + (60-1)d

125 -7 = 59d

118 = 59d

118/59 = d

2 = d

an = a + (n-1)d

a31 = 7 + (31-1)2

a31 = 7 + 30*2

a31 = 7 + 60

a31 = 67

hence, the 31st term is 67