Question

write the missing numbers to complete the series?

21,24,30,39,51,?,?

Answer 1

Answer:

66

Step-by-step explanation:

the multiples of 3 are added in this pattern

Answer 2

Answer:

let the numbers be x and y

21,24,30,39,51,x,y

24-21=3

30-24=6

39-30=9

51-39=12

x-51=15.......................................why 15???

because in the pattern u can see 3 multiples are being  added

x=51+15

x=66

y-x=18

y-66=18

y=18+66

y=84

Step-by-step explanation:

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