Question

1 4 9 15 21 next number is

Answer 1

Hey mate!!!

Here's your answer!!


Given that:
${1}^{2} = > 1 \\ {2}^{2} = > 4 \\ {3}^{2} = > 9 \\ {4}^{2} = 16 - {1}^{2} ( = 1) = > 15 \\ {5}^{2} = 25 - {2}^{2} ( = 4) = > 21 \\ ATQ \: next \: should \: come \\ {6}^{2} = 36 - {3}^{2} ( = 9) = > 27$

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Answer 2

Hey!!
1 4 15 21.
ANSWER---,>
SINCE THERE IS 15+6=21
SO, THERE ALSO WILL BE 21+6=27
HOPE IT WILL HELP YOU.