1.

The value of (-21)×(-21)​

Answer»

ANSWER:

HELO guys its your answer

Step-by-step explanation:

The value of 20! + (21!/1!) + (22!/2!) + ..... + (60!/40!) is (A) 20! 61C20 (B) 21! 60C20 (C) 20! 61C21 (D) 21!



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