can u solve these


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come and exercise your brains

No 17: 11^2 =121, 121-15-12 = 94

Gigwit:
No 17: 11^2 =121, 121-15-12 = 94

hmmm brilliant....what of the other 3?

No 21: 5^2 + (2^2-3^2) = 20, 2^2 + (1^2-1^2) = 4, 3^2 + (4^2-2^2) = 21,
Ans = 1/2

Please can you assist me with recent materials on GRE, i plan to write in early MAY.

I will appreciate your outermost response.

Thank you.