Sequence and Series Session-1
Try these Problems :
(A) 72 (B) 216 (C) 108 (D) 144
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Sequence and Series Session-2
Basic concepts and problems on arithmetic, geometric and harmonic progression have been discussed in the video lecture. Useful for the students appearing for competitive exams.
Try these problems :
(a) 3/5, 4/5 (b) 3/4, 3/5 (c) 2/5, 3/5 (d) none of these
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Sequence and Series Session-3
Problems from previous year papers have been discussed in the session.
A progression is called a harmonic progression (H.P.) if the reciprocals of its terms are in A.P.
Standard form: 1/a, 1/(a +d), 1/(a +2d) ......... 1, 1/2, 1/3, ......... are in harmonic progression and 1, 2, 3..... are in arithmetic progression.
Harmonic Mean:
If three or more numbers are in H.P., then the numbers lying between the first and last are called harmonic means (H.M.’s) between them. For example 1, 1/3, 1/5, 1/7, 1/9 are in H.P. So 1/3, 1/5 and 1/7 are three H.M.’s between 1 and 1/9.
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