HARD
JEE Main
IMPORTANT
Earn 100

Let the sum of the first three terms of an A.P. be and the sum of its last four terms be . If the first term of this A.P. is then the median of the A.P. is :
(a)
(b)
(c)
(d)

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Important Questions on Sequences and Series
HARD
JEE Main
IMPORTANT
The sum of first terms of the series is

HARD
JEE Main
IMPORTANT
If is the of two distinct real numbers and and are three geometric means between , then equals

MEDIUM
JEE Main
IMPORTANT
The sum of the and the terms of a is and the product of its first three terms is If the first term of this is positive, then its term is:

HARD
JEE Main
IMPORTANT
If then is equal to:

HARD
JEE Main
IMPORTANT
Let , where denotes the greatest integer less than or equal to . Then is equal to

HARD
JEE Main
IMPORTANT
The number of terms in an is even, the sum of the odd terms in it is and that the even terms is If the last term exceeds the first term by then the number of terms in the is

HARD
JEE Main
IMPORTANT
Given an A.P. whose terms are all positive integers. The sum of its first nine terms is greater than and less than If the second term in it is , then its term is :

HARD
JEE Main
IMPORTANT
If the sum up to terms is equal to then is equal to
