Multiple choice general knowledge math & puzzles

17, 25, 32, 37, 47, 58, 71, ? ;

  1. 78

  2. 87

  3. 79

  4. 97
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The pattern is adding the sum of the digits of the current number to itself: $17+(1+7)=25$; $25+(2+5)=32$; $32+(3+2)=37$; $37+(3+7)=47$; $47+(4+7)=58$; $58+(5+8)=71$; $71+(7+1)=79$. Thus, the next number is 79.

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