MEDIUM
JEE Main/Advance
IMPORTANT
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The sum of all two digit odd numbers is

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Important Questions on Sequences and Series

EASY
JEE Main/Advance
IMPORTANT
The number of numbers lying between 81 and 1792 which are divisible by 17 is
EASY
JEE Main/Advance
IMPORTANT
The sum to p terms of an Arithmetic Progression is q and the sum to q terms is p. The sum to p+q terms is
MEDIUM
JEE Main/Advance
IMPORTANT
If (3+5+7+ to n terms )(5+8+11+ to 10 terms )=7, then n=?
MEDIUM
JEE Main/Advance
IMPORTANT
In A.M.'s are introduced between 3 and 17 such that the ratio of the last mean to the first mean is 3 : 1, then the value of n is
EASY
JEE Main/Advance
IMPORTANT
Four numbers are in A.P. The sum of first and last is 8 and the product of both middle terms is 15. The least among the four numbers is
MEDIUM
JEE Main/Advance
IMPORTANT
If n A.M.'s are inserted between 2 and 38 such that the sum of the resulting series obtained is 200 , then the value of n is
EASY
JEE Main/Advance
IMPORTANT
If Sn denotes the sum to n terms of an A.P. whose first term is a and common difference is d, then Sn+3-3Sn+2+3Sn+1-Sn is equal to
HARD
JEE Main/Advance
IMPORTANT
If Sn denotes the sum of first n terms of an A.P. and S2n=3Sn then S3nSn is equal to -