MEDIUM
JEE Main/Advance
IMPORTANT
Earn 100

The sum to infinity of the series 1+23+632+1033+1434+ is

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Important Questions on Progression and Series

MEDIUM
JEE Main/Advance
IMPORTANT
A person is to count 4500 currency notes. Let an denotes the number of notes he counts in the nth minute. If a1=a2==a10=150 and a10,a11, are in AP with common difference -2, then the time taken by him to count all notes, is
MEDIUM
JEE Main/Advance
IMPORTANT
A man saves Rs.200 in each of the first three months of his service. In each of the subsequent months, his savings increases by Rs.40 more than the savings of immediately previous month. His total saving from the start of service will be Rs.11040 after
HARD
JEE Main/Advance
IMPORTANT

Statement 1: The sum of the series 1+1+2+4+4+6+9+9+12+16+...+361+380+400 is 8000.

Statement 2: k=1nk3-k-13=n3, for any natural number n.

EASY
JEE Main/Advance
IMPORTANT
If 100 times the 100th term of an A.P with non-zero common difference equals the 50 times its 50th term, then the 150th term of this A.P is: 
HARD
JEE Main/Advance
IMPORTANT
The sum of first 20 terms of the sequence  0.7, 0.77, 0.777, ..., is
HARD
JEE Main/Advance
IMPORTANT
If 109+2111108+3112107++10119=k109, then k is equal to
HARD
JEE Main/Advance
IMPORTANT
If m is the A.M. of two distinct real numbers l and n(l, n>1) and G1, G2 and G3 are three geometric means between l and n, then G14+2G24+G34 equals
MEDIUM
JEE Main/Advance
IMPORTANT
The sum of first 9 terms of the series 131+13+231+3+13+23+331+3+5+ is