CBSE- Arithmetic Progression

Sum of n terms of the series√2 + √8 + √18 + √32... is (a) 1 (b) [n(n + 1)]/√2 (c) [n(n + 1)]/2 (d) 2n(n + 1)

(b) [n(n + 1)]/√2

If the sum of first n even natural number is equal to k times the sum of first n odd natural number then value of k will be (a) 1/n (b) (n - 1)/ n (c) (n + 1)/2n (d) (n + 1)/n

(n + 1)/n

If 3 times the third term of an A.P. is equal to 5 times the fifth term. Then its 8th term is (a) 0 (b) 1 (c) 2 (d) 3

0

The number of terms of an A.P. 3, 7, 11, 15... to be taken so that the sum is 406 is (a) 5 (b) 10 (c) 12 (d) 14

14

In an A.P., [(m+n) th term] + (m-n)th term] is equal to (a) 0 (b) 1 (c) 2 × (mth term) (d) mth term

2 × (mth term)

If the sum of three consecutive terms of an increasing A.P. is 51 and the product of the first and third of these terms is 273, then the third term is (a) 13 (b) 9 (c) 21 (d) 17

21

If the sum of n terms of an A.P. is then its nth term is (a) 4n - 3 (b) 3n - 4 (c) 4n + 3 (d) 3n + 4

4n + 3

The first and last term of an A.P. are 1 and 11. If the sum of its terms is 36, then the number of terms will be (a) 5 (b) 6 (c) 7 (d) 8

6

If 7th and 13th term of an A.P. are 34 and 64 respectively, then its 18th term is (a) 87 (b) 88 (c) 89 (d) 90

89

The 9th term of an A.P. is 449 and 449th term is 9. The term which is equal to zero is (a) 508th (b) 502th (c) 501th (d) none of these

none of these