MEDIUM
CAT
IMPORTANT
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If a, b, c are respectively the xth, yth and zth terms of a G.Pth, then the value of (y-z)loga+(z-x)logb+(x-y)logc:

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Important Questions on Sequence, Series & Progressions

MEDIUM
CAT
IMPORTANT
There are four numbers such that the first three of them form an Arithmetic Progression and the last three form a Geometric Progression. The sum of the first and the third is 2 and that of second and fourth is 26. What is the sum of first and fourth numbers?
MEDIUM
CAT
IMPORTANT

Find the sum up to 'n' terms of the series 1+3+7+15 +....

MEDIUM
CAT
IMPORTANT

Find the sum of 12+322+523+......+2n-12n.

MEDIUM
CAT
IMPORTANT
Find the sum to n terms of the series 11+102+1003+10004+:
MEDIUM
CAT
IMPORTANT
Find the sum to first n groups of (1)+(1+3)+(1+3+9)+(1+3+9+27)+
HARD
CAT
IMPORTANT
Find the sum to n terms of the following series: 2+5+14+41+
EASY
CAT
IMPORTANT
Find the sum to n terms : 1+2x+3x2+4x3+x1
MEDIUM
CAT
IMPORTANT
Find the sum to n terms of 1+3x+5x2+7x3+, x11$