Question : The sum of 10 terms of the arithmetic series is 390. If the third term of the series is 19, find the first term:

Option 1: 3

Option 2: 5

Option 3: 7

Option 4: 8

Question : If 7 times the 7^th term of an arithmetic progression (A.P.) is equal to 11 times its 11^th term, then the 18^th term of the A.P. will be:

Option 1: 1

Option 2: 0

Option 3: 2

Option 4: –1

Question : The 3^rd and 8^th terms of an Arithmetic progression are –14 and 1, respectively. What is the 11^th term?

Option 1: 14

Option 2: 16

Option 3: 20

Option 4: 10

Question : The sum of the first 20 term of the series $\frac{1}{5×6}+\frac{1}{6×7}+\frac{1}{7×8}+....$ is:

Option 1: 0.16

Option 2: 1.6

Option 3: 16

Option 4: 0.016

Question : The sum of two numbers is equal to 25 and their difference is 20. The ratio of the two numbers is:

Option 1: 9 : 1

Option 2: 7 : 9

Option 3: 3 : 5

Option 4: 2 : 7