Select the related word/letters/number from the given alternatives.
56 : 72 :: 90 : ?
- A96
- B97
- C100
- D110
Solution & Step-by-step Explanation
The relationship between the numbers is based on the multiplication of consecutive integers:
56=7×8
72=8×9
90=9×10
Following the sequence, the next term will be:
10×11=110
Alternatively, using the n
2
+n pattern:
7
2
+7=49+7=56
8
2
+8=64+8=72
9
2
+9=81+9=90
10
2
+10=100+10=110
56=7×8
72=8×9
90=9×10
Following the sequence, the next term will be:
10×11=110
Alternatively, using the n
2
+n pattern:
7
2
+7=49+7=56
8
2
+8=64+8=72
9
2
+9=81+9=90
10
2
+10=100+10=110