Question:
in part 3 in 11 to 20 square of that 14square is 196 u have said that in video that like 12square is 144 2square is 4 so last digit is 4 you have said us like this ,but in 14square answer is 196 4square is 8 but that square is 196 there last digit should be 8 but how 6 came
Answer:
If a number is a square, then its unit digit must be any of the 0, 1, 4, 5, 6, 9
Now, 142 = 14 * 14 = 196 {unit digit is 6}
122 = 12 * 12 = 144 {unit digit is 4}
42 = 4 * 4 = 16 {unit digit is 6}
So, 42 is 16 not 8
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