Q. Solved PYQ : Math

Q. 99 × 98 


Solution:              Formulla = (99×N) = (100−1) × N
= (100 − 1) × 98
= 9800 − 98
= 9702 


Ans: 9702


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Q. What is the value of (−1)2026 + (−1)2027 ?


A) 2   B) −2   C) 0   D) 1


Ans: C) 0


Trick:



  • Even power → (−1)2026 = +1

  • Odd power → (−1)2027 = −1


So,  1 − 1 = 0


Ans: C) 0


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Q If 3x−5 = 2x + 7, then find x2− 4x , 


A) 120  B) 96  C) 140  D) 144


Solution


3


3x − 2x = 7 + 5 



Now,


x2−4x = 122−4(12)


=144−48 = 96



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