Others Maths Puzzle

A man invests a principal in a simple interest based scheme, such that the rate of interest increases in a geometric progression every year with the common ratio 2. If the amount becomes four times in 4 years, then in how many years will it become 52 times?

(a) 5 years
(b) 8 years
(c) 13 years
(d) None of these

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Others Other Question

Five sentences are given below labeled A, B, C, D and E. They need to be arranged in a logical order to form a coherent paragraph/passage. From the given options, choose the most appropriate one.

A. We now learn that the Met office had issued warnings of heavy rain which seem to have been overlooked by the authorities, leading to the catastrophic events in Uttarakhand.
B. The excuse, almost always, is that the reports were not specific.
C. Usually after a terror attack, the biggest being the Mumbai 26/11, one gets to hear that there were intelligence reports warning of the danger.
D. Forewarned is forearmed, unless you happen to be in this neck of the woods.
E. This latest incident is of a piece with many others that have taken place, whether it deals with terror or natural tragedy.

a ADEBC
b CBEAD
c DCBAE
d DAECB
N=10!+11!+12!...........1000! Find no. Of 2's.