find the value of 5+55+55+555+…………..+ n terms
5+55+55+555+…………..+ n terms 5(1+11+111+………………………+ n terms) Multiply and divide by 9 9/9 × 5(1+11+111+………………………+ n terms) 5/9 × (9+99+999+ …………………+ n terms) 5/9 × [(10-1) + (100-1) + (1000-1) +…………… + n terms] 5/9 × [(10 + 10² + 10³ +………+ n terms) – (1+1+1+………+ n terms)] 5/9 × [(10 + 10² + 10³ +………+ n terms) – n] In the series [10 + 10² + 10³ +………+ n terms] First term, a = 10 common ratio, r = 10 Sum of n terms = (a(r^n-1))/((r-1)) Therefore The required answer = 5/9 [((10(〖10〗^n-1))/9 - n)]
Which two numbers should be interchanged to make the given equation correct?
14 + 32 − 56 ÷ 28 × 5 = 40
By interchanging the given two signs which of the following equation(s) will be correct?
+ and x;
I. 16 x 9 + 2 ÷ 3 – 5 = 17
...If a mirror is placed on the line MN, then which of the answer figures is the mirror image of the given figure?
Which of the following numbers will replace the question mark (?) in the given series?
50, 86, ?, 127, 136, 140, 141
A paper has been folded and cut as shown. Figure (X) shows the manner in which the folded paper has been cut. Choose a figure which would most closely r...
The ratio of the ages of a child, his father and grandfather is 1 : 5 : 9. Three years hence, the child will be 10 years old. What is the present age of...
Sahil is father of Akshita and Raj is son of Roohi. Aman is brother of Sahil. If Akshita is sister of Raj, then how is Roohi related to Aman?
Select the number from among the given options that can replace the question mark (?) in the following series.
11, 19, 35, 59, ? , 131
...Select the correct mirror image of the given figure when the mirror is placed at MN as shown below.
In certain code language.
'You are bad' is written as 'YO LO PO', 'Schools are bad' is written as 'NO PO YO', and 'You are human' is written as '...