75 previous number is 37 so 37*2+1=75 37 previous number is 19 so,19*2-1=37 assume 19 previous number is x: 19 previousnumber is x so x*2+1 by substitute the given options in x 1.10*2+1=21(is not the next number) 2.9*2+1==19(is the next number) 3.3*2+1=7 4.8*2+1=17 so the option 2 is correct bcz x of next number is 19
9
because in this series the order is that even term is double of first term plus 1 and odd term is double of second term minus 1 so following this series we get the unknown no by
2×2+1=5
5×2-1=9
9×2+1=19
so the answer is 9.