What is the unit digit of the sum of the firs | vedclass

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(C) The first $111$ whole numbers are $0, 1, 2, \dots, 110$.This is an arithmetic progression where the first term $a = 0$,the last term $l = 110$,and

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$5$

Vedclass · Answer

(C) The first $111$ whole numbers are $0, 1, 2, \dots, 110$.This is an arithmetic progression where the first term $a = 0$,the last term $l = 110$,and the number of terms $n = 111$.The sum of an arithmetic progression is given by $S_n = \frac{n}{2}(a + l)$.Substituting the values: $S_{111} = \frac{111}{2}(0 + 110)$.$S_{111} = \frac{111}{2} 	imes 110$.$S_{111} = 111 	imes 55$.$S_{111} = 6105$.The unit digit of $6105$ is $5$.

$101$	$323$	$545$	$767$	$989$	$111011$
$34$	$(A)$	$(B)$	$(C)$	$(D)$	$(E)$

What is the unit digit of the sum of the first $111$ whole numbers?

Similar Questions

Find the odd number from the given sequence: $2, 10, 18, 54, 162, 486, 1458$.

Find the missing term in the series: $3, 22, ?, 673, 2696, 8093$.

$4, 10, 33, 136, 685, ?$

In the following number series,only one number is wrong. Find out the wrong number.
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$101$ $323$ $545$ $767$ $989$ $111011$
$34$ $(A)$ $(B)$ $(C)$ $(D)$ $(E)$

What should come in place of $A$?

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