If the sum of n terms of an A.P. be 3n 2 + n and its common difference is 6, then its first term is

Here, Sn= 3n2 + nd = 6Putting n= 1S1 = 3 + 1 = 4Sum of first 1 term = first term = 4

Q3 of 202 Page 10

If the sum of n terms of an A.P. be 3n² + n and its common difference is 6, then its first term is

Here, S_n= 3n² + n

d = 6

Putting n= 1

S₁ = 3 + 1 = 4

Sum of first 1 term = first term = 4

If 7th and 13th terms of an A.P. be 34 and 64 respectively, then its 18th term is

If the sum of P terms of an A.P. is q and the sum of q terms is p, then the sum of p + q terms will be

The first and last terms of an A.P. are 1 and 11. If the sum of its terms is 36, then the number of terms will be

If the sum of n terms of an A.P. is 3n² + 5n then which of its terms is 164?