Question

1+2=21 ,2+3=36,3+4=43,4+5=?​

Answer 1

Answer:

1 + 2 = 21

2 + 3 = 36

3 + 4 = 43

4 + 5 = 54

Answer 2

Number in place of ? is 58

Step-by-step explanation:

Here

Two alternate series are given in which:

• 1+2 =21     [By reversing the digits]

        i.e 1+2 = 12 ≡ 21

        3+4= 43   [By reversing the digits]

        i.e 3+4 = 34 ≡ 43

• 2+3=36 [ reverse of digits + 4]

        i.e 2+3 =23 ≡ 32 + 4 =36

       Similarly, 4+5 = 45 ≡54 + 4 = 58