J's answer to Coral's Primary 6 Maths Data Analysis Singapore question.
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The pattern is : -8, -3, -8, -3,...
Odd to even term number : -8
Even to odd term number : -3
Every jump of two terms, the total subtraction is 11 (-8 followed by -3)
You need the 56th term. From 1st term (odd) to 55th term (odd), it is a jump of 55 - 1 = 54 terms
54 ÷ 2 terms per jump = 27 jumps
999 - 27 × 11 = 999 - 297 = 702
Then from 55th term (odd) to the 56th term (even), we subtract 8.
702 - 8 = 694
Option (3) is the correct answer.
Odd to even term number : -8
Even to odd term number : -3
Every jump of two terms, the total subtraction is 11 (-8 followed by -3)
You need the 56th term. From 1st term (odd) to 55th term (odd), it is a jump of 55 - 1 = 54 terms
54 ÷ 2 terms per jump = 27 jumps
999 - 27 × 11 = 999 - 297 = 702
Then from 55th term (odd) to the 56th term (even), we subtract 8.
702 - 8 = 694
Option (3) is the correct answer.
Date Posted:
3 years ago
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Alternatively, you can also choose to jump from the 2nd term to the 56th term (it is also moving forward by 54 terms and 27 jumps)
991 - 297 = 694