Solve the following questions: 3m each 1. Find the 15 term of the AP 4,6,8,10..... 2. Find the no of terms in the given AP 1,3,5,7,9,...............,151 3. Find the common difference of the AP 1/p,1−p/p,1−2p/p,… 4. Find the common difference of the A.P. 1/2b, 1−6b/2b, 1−12b/2b,… 5. What is the common difference of an A.P. in which a21 – a7 = 84 6. The angles of a triangle are in A.P., the least being half the greatest. Find the angles 7. The 7th term of an A.P. is 20 and its 13th term is 32. Find the A.P. 8. How many two-digit numbers are divisible by 3 9. Find the middle term of the A.P. 6, 13, 20, …, 216. 10. Find the number of all three-digit natural numbers which are divisible by 9