RRB 2009 Allahabad Train Clerk

Question 72

If $$(a^{2}-b^{2})$$ = 81 and (a+b) = 27 then (a-b) will be equal to

Solution

(a+b)(a-b) = $$(a^{2}-b^{2})$$

Therefore the answer is a-b = 81/27 = 3

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