Question

19. What is the unit digit of the following sum: 1+ 22+ 33+44 +55 +66?
(a) 0
(b) 4
(c) 7
(d) 9
20. If x= 1 + 21/2 and y = 1 - 21/2, then x2 + y2 is
(a) 2
(b) 3
(c) 6
(d) 0​

Answer 1

Answer:

Both Answer is 0

Step-by-step explanation:

Sum the Whole number and find the last

and second if x = 21/2

and y = -21/2 then subtract then the answer will be come

First wale me tum 1 ko mat ginna kyuki uska koi unit soft nahi hai

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