Maths Maths Puzzle Logical Reasoning Decision Making and Problem Solving

What is the next number of the following sequence
18, 17, 22, 12, 15, 23, 41, 21, ?

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please solve the question
10 years agoHelpfull: Yes(1) No(0)

hi ganesh babu
please I need solve the question
10 years agoHelpfull: Yes(1) No(1)

Maths Other Question

.A car traveling with uniform speed. There r 15 poles. A car travel from 1 to 10th pole in 10 seconds. the poles are equally spaced. then how many seconds it takes to reach the 15th pole? if f(f(n)) + f(n) =2n+3
and f(0)=1
f(2012)=?