Question 869790: Q. What is the next number of the following sequence
1, 2, 5, 10, 25, 50, ___
Found 2 solutions by ramkikk66, richwmiller:
Answer by ramkikk66(644)   (Show Source):
You can put this solution on YOUR website! Next number should be 125.
Starting from 1, keep multiplying by 2 and 2.5 (alternatingly) to get the successive terms.
1 * 2 = 2
2 * 2.5 = 5
5 * 2 = 10
10 * 2.5 = 25
25 * 2 = 50
50 * 2.5 = 125 (next term)
Hope you got it :)
Answer by richwmiller(17219)  (Show Source):
You can put this solution on YOUR website! here are two possible solutions
a(n) = (n^4-8 n^3+24 n^2-32 n+10)/(2 n-7)
1, 2, 5, 10, 25, 50, 619/7, 430/3, 2395/11, 4090/13, 437, 9994/17, 14635/19, 6910/7, ...
or
a(n) = 5a(n-2)
or
a(n)=(-2n-1)/(5n^2-1)
1, 2, 5, 10, 25, 50, 125, 250, 625, 1250, 3125, 6250, 15625, 31250, 78125, 156250, 390625, 781250, 1953125, 3906250, 9765625, 19531250, 48828125, 97656250, 244140625, 488281250, 1220703125, 2441406250, 6103515625, 12207031250
The real problem is so few terms are given.
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