Mark the correct alternative in the following:
Sum of all two digit numbers which when divided by 4 yield unity as remainder is
Two digits numbers which when divided by 4 yield unity as remainder is A.P. as 13, 17, 21,…,97
In this A.P., first term is a=13
Last term is l=97
And d=17-13=4
Now, l=an=a+(n-1)d
∴ 97=13+(n-1)4
∴ 84=(n-1)4
∴ 21=n-1
∴ n=22
Now,
=11×110
=1210