Question

Complete the series.
17, 25, 42, 77, ?

Answer 1

Answer:

Just sum up the digits of the given pairs of two digits and then add the resulting sum to itself to get the next one.

i.e.,

13 is a pair of 1 and 3 , so as to get the next pair of digits just sum up 1 and 3 and we will get 4 :

1 + 3 = 4

Now add the above result (4) to 13 itself , now we will get the next pair of digits :

13 + 4 = 17

17 is a pair of 1 and 7 ,

1 + 7 = 8

Now add the above result (8) to 17 as to get the next pair of digits

17 + 8 = 25

25 : 2 + 5 =7 ; 25 + 7 = 32

32 : 3 + 2 =5 ; 32 + 5 = 37

37 : 3 + 7 = 10 ; 37 + 10 = 47

47 : 4 + 7 = 11 ; 47 + 11 = 58

Step-by-step explanation:

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