Book Maths Puzzle Category

What is the next number in this sequence...
14,56,458,860,1263,....

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Book Other Question

How many numbers are there in all from 6000 to 6999 (both 6000 and 6999 included) having at least one of their digits repeated ??

(a) 216
(b) 356
(c) 496
(d) 504
P Q R can complete a work in 18 days . they work together for 2 days and then P leave. if their rate of work is equal in how many days will remaining work will be completed ?