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(a)  Figure  6  =  17             Figure 7 = 20

(b)    Figure     2           4         6         8    ……..

                          7          12        17       22    ……..          Difference between terms  = 5

           Term     a1          a2           a3        a4                       (even series)

Using  an  = first term + (n-1) x difference

Figure 120  = a120/2   = a60   = 7 + (60-1) x 5 =  7 + 295 = 302

(c)   Figure                 3             5              7         

                                   10            15           20                                Difference between terms  = 5

Map orig  Term      a1+2          a2+3          a3+4             (odd series beginning with term 3)

10 + (n-1) 5 = 230

5n – 5 = 220

5n = 225

n = 45

Map to orig term = n + (n+1)  =  45 + (45+1)  = 91

Hence the Figure mapping to 230 sticks is  Figure 91.                        

 

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Thank you so much!

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I think this is similar to the question posted here.

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Sorry but I don’t really understand the other link you gave, if possible, can you show me the equation for this question? This question is challenging and I’m still stuck at it. Thanks so much.

 

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