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JEE MATHEMATICS MCQ: PERMUTATIONS

1 Medium

1 of 1

Analyzing +4 | -1

Let

n=1 !+4 !+7 !+\cdots+400

!. Then ten's digit of

n

is

View answer and explanation

Correct option: B

6

Option B (6) is correct because after calculating the sum of factorials, the tens digit is determined to be 6.

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