3 5 7 11 15 17 19 which is the next number

23
because the difference of two successive number is 2,2,4 in that series
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i think it is series of prime numbers..so answer is 23..
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Ans is "23" bcoz here for 1st & 2nd no's 2 is added.
Similarly for 3rd & 4th no's 4 is added.
similarly for 5th & 6th no's 2 is added.
In that way he is following a sequence of 2,2,4,4,2,2,4,4
Next number is added by 4 i.e 23
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Difference between first and second number - 2
Difference between Second and third number - 2

Difference between third and fourth number - 4
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Difference between seventh and eighth number - 4

19+4 = 23Ans
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ans is 21
3-5=2
7-5=2 and so on
i think 21
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23
because the difference between two successive numbers is 2 2 4 in this sequence
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21 in first two numbers difference is 1 and then 2 and so on
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series is 3,5,7,11,15,17,19,...
The next number is 23 because the alternate terms starting from second number i.e (5,11,17) have successive difference between them as 6.
So, 17+6=23
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3,5,7,11,15,17,19......which is the next number