Question

which of the following statement is true ???
1-if (xn) has a convergent subsequence then (xn) must be cauchy
2- if (xn) has aconvergent subsequence then (xn) must be a bounded sequense
3- the sequence sin (nπ/2) has anot convergent sequence
4- the sequence (ncos1/n) has a convergent subsequence

Answer 1

Answer:

according to me the 3 statement is true

plzzzzzzz make it a brainlist answer