In a school, no of student in every standard are 10 multiple of standard total students in the sch

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06 Jul 2010 number of student in the school

In a school, no of student in every standard are 10 multiple of standard total students in the school from 1 to 12 standard are

OPtion

1) 890
2) 120
3) 478
4) 1450
5) 780
6) 990
7) 895
8) 1000
9) 1230
10) 2390

Solution

total students = 10 + 20 + …….+ 120 = 780
Formula used is S = (no of classes) *(first term + last term)/2

Correct Option: 5 Best Solution (0)