HARD
11th ICSE
IMPORTANT
Earn 100

If pth term of an A.P. is q and qth term is p find its rth term.

Important Questions on Sequences and Series

HARD
11th ICSE
IMPORTANT
If (p+1)th term of an A.P. is twice the (q+1)th term, prove that its (3p+1)th term is twice the (p+q+1)th term.
MEDIUM
11th ICSE
IMPORTANT
If a, b, c are pth, qth and rth terms respectively of an A.P. prove that p(b-c)+q(c-a)+r(a-b)=0.
MEDIUM
11th ICSE
IMPORTANT
If a, b, c are pth, qth and rth terms respectively of an A.P. prove that a(q-r)+b(r-p)+c(p-q)=0.
EASY
11th ICSE
IMPORTANT
Find the 20th term from the end of the sequence 3, 8, 13,, 253.
MEDIUM
11th ICSE
IMPORTANT
For what value of n the nth terms of the sequences 3, 10, 17 , and 63, 65, 67,  are equal?
HARD
11th ICSE
IMPORTANT
In the sequences 2, 5, 8,  up to 50 terms and 3, 5, 7,  up to 60 terms, find the number of identical terms.
HARD
11th ICSE
IMPORTANT
Find the number of common terms in the two sequences:3, 7, 11, , 407 and 2, 9, 16, , 709.
MEDIUM
11th ICSE
IMPORTANT
How many numbers of two digits are divisible by 6?