Question 16

Select the number that DOES NOT belong to the following group.
1, 2, 6, 21, 88, 446, 2676

Solution

1, 2, 6, 21, 88, 446, 2676....

$$1\times1+1=2$$,

$$2\times2+2=6$$,

$$6\times3+3=21$$,

$$21\times4+4=88$$,

$$88\times5+5=445$$, (but in question 446 is given, hence 446 is wrong number series)

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Select the number that DOES NOT belong to the following group.1, 2, 6, 21, 88, 446, 2676