Question

5. The common difference of the A.P whose Sn = 3n2 + 7n is
b) 2
c) 1
d) 5
6. The 31st term of an AP whose first two terms are - 3 and 4 is
a) 210
b) 137
c) 207
d) 200
7. In an A.P. it is given that a = 5, d = 3 and an = 50, then the value of 'n' is
a) 16
b) 18
C) 20
d) 15
8. The value of k' for which the numbers x, 2x + k, 3x + 6 are in A.P. is
a) 3
b) 6
d) 4
C) 5​

Answer 1

Answer:

5 a)6 is the answer

6 c)207 is the answer

7 a) 16 is the answer

8 a) 3 is the answer