which number will replace the question mark in the following 1,11,120     2,7,45   3,5,?

45
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It is 20.
 
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20
 
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20
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pl explain it by solvibg
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It's 16
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It's 16 As we see in first group 1 11 120 i.e., 11^2-1^2 =120 Similarly 7^2-2^2=45 In the same way , 5^2-3^2=16 So, ans. is 16
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16 ans
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