Question

Complete the series 15 10 18 15 21 20 24 ?

Answer 1

twenty
may it help s u

Answer 2

If we see the first two terms, the product is (15-10=5) which is odd number  $o_1$

If we see the next two terms, the difference is (10-18=-8) which is even number $e_1$

If we see the next two terms, the difference is (18-15=3) which is odd number $o_2$ which differs from $o_1$ by 2

If we see the next two terms, the difference is (15-21=6) which is even number $e_2$ which differs from $e_1$ by 2

If we see the next two terms, the difference is (21-20=1) which is odd number $o_3$ which differs from $o_2$ by 2

If we see the last two terms, the difference is (|20-24|=4) which is even number $e_3$ which differs from $e_2$ by 2

The next term should be such that when we find the difference it should give an odd number and that odd number should be 2 less than $o_3$

So the next odd number after 1 is (1-2=-1)

so 24-(-1)=24+1=25

So, 25 is the next number in the sequence