How to solve Missing Numbers Questions: Tips and Tricks
How to solve Missing Numbers Questions: Tips and Tricks
Ssc cgl exam 2017
Easy maths tricks for missing numbers
Note: I told you they are squares, but if it didn’t hit your mind…you need practice. Now see the following rule.
Ssc cgl exam 2017
Easy maths tricks for missing numbers
Finding Missing Numbers
To find a missing number, first I will have to find a Rule behind the Sequence.
Sometimes I can just look at the numbers and see a pattern:
Example: 1, 4, 9, 16, ?
AnsIr: they are Squares (12=1, 22=4, 32=9, 42=16, …)Note: I told you they are squares, but if it didn’t hit your mind…you need practice. Now see the following rule.
Rule: xn = n2
Sequence: 1, 4, 9, 16, 25, 36, 49, …
Did you notice how I wrote that rule using “x” and “n” ?
xn means “term number n”, so term 3 is written x3
And I also used “n” in the formula, so the formula for term 3 is 32 = 9. This could be written
x3 = 32 = 9
is not it?
Once I master this Rule I can use it to find any term. For example, the 25th term can be found by “plugging in” 25 wherever n is.
x25 = 252 = 625
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Missing number questions SSC cgl exam 2017
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